diff --git a/.envrc b/.envrc
index ff5954f..8392d15 100644
--- a/.envrc
+++ b/.envrc
@@ -1 +1 @@
-use flake . --impure
\ No newline at end of file
+use flake
\ No newline at end of file
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..03197b2
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,37 @@
+name: CI
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install Nix
+        uses: cachix/install-nix-action@v24
+        with:
+          extra_nix_config: |
+            experimental-features = nix-command flakes
+
+      - name: Check flake
+        run: nix flake check
+
+      - name: Format check
+        run: nix develop -c cargo fmt -- --check
+
+      - name: Clippy
+        run: nix develop -c cargo clippy --all-targets --all-features -- -D warnings
+
+      - name: Test
+        run: nix develop -c cargo test --workspace
+
+      - name: Build
+        run: nix build .#leeward-x86_64
+
+      - name: Security audit
+        run: nix develop -c cargo audit
\ No newline at end of file
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
new file mode 100644
index 0000000..d3d8391
--- /dev/null
+++ b/.github/workflows/release.yml
@@ -0,0 +1,112 @@
+name: Release
+
+on:
+  push:
+    tags:
+      - 'v*'
+  workflow_dispatch:
+    inputs:
+      tag:
+        description: 'Release tag (e.g., v0.1.0)'
+        required: true
+        type: string
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install Nix
+        uses: cachix/install-nix-action@v24
+        with:
+          extra_nix_config: |
+            experimental-features = nix-command flakes
+            accept-flake-config = true
+
+      - name: Setup Cachix
+        uses: cachix/cachix-action@v14
+        with:
+          name: leeward
+          skipPush: true
+
+      - name: Build all packages
+        run: |
+          # Build all outputs
+          nix build .#leeward-x86_64 -L
+          nix build .#leeward-aarch64 -L
+          nix build .#leeward-static -L
+          nix build .#leeward-deb -L
+
+          # Copy artifacts
+          mkdir -p artifacts
+          cp -L result*/* artifacts/ || true
+
+      - name: Create release archives
+        run: |
+          cd artifacts
+
+          # Create tarballs for each architecture
+          for arch in x86_64 aarch64; do
+            if [ -d "leeward-$arch" ]; then
+              tar czf "leeward-${arch}-linux.tar.gz" "leeward-$arch"
+            fi
+          done
+
+          # Create checksums
+          sha256sum *.tar.gz *.deb > checksums.txt || true
+
+          cd ..
+
+      - name: Upload artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: release-artifacts
+          path: artifacts/*
+
+  release:
+    needs: build
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Download artifacts
+        uses: actions/download-artifact@v4
+        with:
+          name: release-artifacts
+          path: artifacts
+
+      - name: Create Release
+        uses: softprops/action-gh-release@v1
+        with:
+          tag_name: ${{ github.event.inputs.tag || github.ref_name }}
+          name: Release ${{ github.event.inputs.tag || github.ref_name }}
+          draft: false
+          prerelease: false
+          files: |
+            artifacts/*.tar.gz
+            artifacts/*.deb
+            artifacts/checksums.txt
+          body: |
+            ## Installation
+
+            ### Debian/Ubuntu
+            ```bash
+            wget https://github.com/vektia/leeward/releases/latest/download/leeward_*_amd64.deb
+            sudo dpkg -i leeward_*.deb
+            ```
+
+            ### Binary (x86_64)
+            ```bash
+            curl -L https://github.com/vektia/leeward/releases/latest/download/leeward-x86_64-linux.tar.gz | tar xz
+            sudo mv leeward-x86_64/* /usr/local/bin/
+            ```
+
+            ### Nix
+            ```nix
+            nix run github:vektia/leeward/${{ github.event.inputs.tag || github.ref_name }}
+            ```
+
+            See [CHANGELOG.md](https://github.com/vektia/leeward/blob/main/CHANGELOG.md) for changes.
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
index e07339f..d10f70d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
+# Python
 __pycache__/
 .pytest_cache/
 .ruff_cache
@@ -9,19 +10,22 @@ __pycache__/
 dist/
 build/
 *.egg-info/
+*.whl
 
+# Rust
 target/
-Cargo.lock
-
-*.whl
 *.so
 
+# Development tools
 .direnv/
 .devenv/
 .pre-commit-config.yaml
-
-/target
-
 .cargo-home/
 
-include/
\ No newline at end of file
+# Nix build results
+result
+result-*
+
+# Runtime files
+*.sock
+.leeward.sock
\ No newline at end of file
diff --git a/ADOPTION.md b/ADOPTION.md
deleted file mode 100644
index 7a1d47e..0000000
--- a/ADOPTION.md
+++ /dev/null
@@ -1,24 +0,0 @@
-# Using leeward?
-
-We'd love to hear from you. Knowing who uses leeward helps us:
-
-- 📊 Demonstrate impact to sponsors
-- 🎯 Prioritize features that matter
-- 💪 Keep the project alive and maintained
-
-## How to let us know
-
-**Option 1: Public**
-
-Open an issue with the `adoption` label including:
-- Company name (or "confidential")
-- Use case (one line)
-- Approximate executions/month
-
-**Option 2: Private**
-
-Email hello@vektia.com.br
-
----
-
-Thank you for strengthening open source 🙏
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..d49d528
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,39 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Added
+- Initial release of leeward
+- Pre-fork worker pool architecture for ~0.5ms latency
+- Linux namespace isolation (pid, mount, net, ipc, uts)
+- Seccomp syscall filtering
+- Landlock filesystem restrictions
+- Unix socket IPC between daemon and CLI
+- MessagePack protocol for communication
+- Systemd service files (system and user)
+- Nix flake support with overlay
+- Debian package generation
+- Static musl binary builds
+- Multi-architecture support (x86_64, aarch64)
+
+### Architecture
+- `leeward-core`: Core isolation primitives
+- `leeward-daemon`: Persistent daemon with worker pool
+- `leeward-cli`: Command-line interface
+- `leeward-ffi`: C FFI library for language bindings
+
+### Security Features
+- No root required (uses user namespaces)
+- Defense in depth with 3 isolation layers
+- Zero network access by default
+- Restricted filesystem access via Landlock
+- Minimal syscall whitelist via seccomp
+
+## [0.1.0] - TBD
+
+Initial public release.
\ No newline at end of file
diff --git a/CLAUDE.md b/CLAUDE.md
deleted file mode 100644
index d2f426e..0000000
--- a/CLAUDE.md
+++ /dev/null
@@ -1,265 +0,0 @@
-# CLAUDE.md
-
-This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
-
-## Project Overview
-
-**leeward** is a Linux-native sandbox for running untrusted code (currently Python) with extremely low latency (~0.5ms vs Docker's 300-500ms). It's designed for AI agent code execution using native Linux primitives instead of containers or VMs.
-
-**Status:** Work in progress. Implementing advanced pre-fork pool with io_uring and shared memory.
-
-## Architecture
-
-### Pre-Fork Execution Model
-```
-┌──────────────┐   io_uring/shm    ┌─────────────────────────────────┐
-│    Client    │ ◄───────────────► │      leeward daemon             │
-│   (any lang) │   zero-copy IPC   │                                 │
-└──────────────┘                   │  ┌───────────────────────────┐  │
-                                   │  │ Pre-warmed Worker Pool    │  │
-      Python, Go,                  │  │                           │  │
-      Node, Rust                   │  │ [W1] Python idle ──pipe   │  │
-      via C FFI                    │  │ [W2] Python idle ──pipe   │  │
-                                   │  │ [W3] Python idle ──pipe   │  │
-                                   │  └───────────────────────────┘  │
-                                   └─────────────────────────────────┘
-```
-
-- **leeward-daemon**: Persistent daemon maintaining pre-forked worker pool
-- **leeward-cli**: Command-line interface for executing code
-- **leeward-ffi**: C FFI library for multi-language support
-- **leeward-core**: Core isolation primitives and worker management
-
-### Performance Architecture (4 Levels)
-
-**Level 1: Pre-fork Pool (~0.5ms)**
-- Workers created at daemon startup using `clone3` with `CLONE_INTO_CGROUP`
-- Python interpreter already loaded and idle
-- Code sent via pipe, execution happens immediately
-- No fork/exec overhead on each request
-
-**Level 2: io_uring IPC (~0.2ms savings)**
-- Zero-copy async I/O using io_uring submission queues
-- 1 syscall per batch vs 4 syscalls per request (write/read/write/read)
-- Batched request processing
-
-**Level 3: Shared Memory (~0.1ms savings)**
-- Results written to `memfd_create` + `mmap` shared region
-- Client and daemon map same file descriptor
-- Eliminates 2 kernel copies (worker→daemon→client becomes worker→shared memory)
-- Request/response arenas in shared memory
-
-**Level 4: SECCOMP_USER_NOTIF (no worker recycling)**
-- Blocked syscalls notify supervisor instead of killing process
-- Supervisor returns `EACCES` to continue execution
-- Workers don't die on denied syscalls, no recycling needed
-- Graceful degradation vs fatal termination
-
-### Isolation Layers (Defense in Depth)
-1. **Linux namespaces** via `clone3` (user, pid, mount, net, ipc, uts)
-2. **seccomp user notifications** (`SECCOMP_USER_NOTIF`) - supervisor-mediated syscall filtering
-3. **Landlock** filesystem restrictions (whitelist-based)
-4. **cgroups v2** resource limits via `CLONE_INTO_CGROUP` (256MB RAM, 100% CPU, 32 PIDs, 30s timeout)
-
-### Communication Protocol
-- **Client ↔ Daemon**: io_uring submission queue or Unix socket fallback
-- **Daemon ↔ Worker**: Anonymous pipes for code delivery
-- **Results**: Shared memory region (memfd) mapped by both daemon and client
-- **Serialization**: MessagePack for control messages
-- **Worker lifecycle**: Long-lived, survives denied syscalls (SECCOMP_USER_NOTIF)
-
-## Workspace Structure
-
-```
-crates/
-├── leeward-core/          # Core isolation primitives
-│   └── src/
-│       ├── config.rs      # SandboxConfig with resource limits
-│       ├── worker.rs      # Worker process management
-│       ├── result.rs      # ExecutionResult, ExecutionMetrics
-│       ├── error.rs       # Error types
-│       └── isolation/     # Isolation mechanisms
-│           ├── namespace.rs   # setup_namespaces()
-│           ├── seccomp.rs     # setup_seccomp()
-│           ├── landlock.rs    # setup_landlock()
-│           ├── cgroups.rs     # setup_cgroups()
-│           └── mounts.rs      # setup_mounts()
-├── leeward-daemon/        # Persistent daemon
-│   └── src/
-│       ├── main.rs        # Entry point, signal handling
-│       ├── config.rs      # DaemonConfig (pool size, socket path)
-│       ├── pool.rs        # WorkerPool management
-│       ├── server.rs      # UnixServer for client connections
-│       └── protocol.rs    # Request/Response types
-├── leeward-cli/           # CLI interface
-│   └── src/
-│       └── main.rs        # Commands: exec, status, ping, run
-└── leeward-ffi/           # C FFI bindings
-    └── src/
-        └── lib.rs         # leeward_execute(), leeward_free_result()
-```
-
-## Build System
-
-### Cargo (Primary)
-```bash
-# Development
-cargo build
-cargo test
-cargo check
-cargo clippy
-
-# Aliases (from .cargo/config.toml)
-cargo b          # build
-cargo br         # build --release
-cargo t          # test
-cargo c          # check
-cargo cl         # clippy
-cargo daemon     # run daemon in release mode
-cargo cli        # run CLI in release mode
-
-# Release build (with LTO, single codegen unit, stripped)
-cargo build --release
-
-# Test specific crate
-cargo test -p leeward-core
-cargo test --workspace
-```
-
-### Nix (Optional, for reproducible builds)
-```bash
-# Build specific targets
-nix build .#cli      # CLI binary
-nix build .#daemon   # Daemon binary
-nix build .#ffi      # C FFI library (.so and .a)
-nix build            # Default: all targets
-
-# Development shell (includes Rust, mold linker, all deps)
-nix develop
-```
-
-### Build Configuration
-- **Rust version:** 1.85 (edition 2024)
-- **Linker:** mold (via clang) for faster builds
-- **Release optimizations:** LTO=fat, codegen-units=1, strip=true, opt-level=3
-- **Dependencies optimized** at opt-level=3 even in dev builds (for package.*)
-
-## Development Commands
-
-### Running the daemon
-```bash
-cargo daemon
-# Or with args:
-cargo run --release --bin leeward-daemon -- --pool-size 10
-```
-
-### Using the CLI
-```bash
-cargo cli exec "print('hello world')"
-cargo cli status
-cargo cli ping
-```
-
-### Testing
-```bash
-cargo test                    # All tests
-cargo test --workspace        # Explicit workspace tests
-cargo test -p leeward-core    # Single crate
-```
-
-Test locations:
-- `tests/integration/` - Integration tests
-- `tests/escapes/` - Security/escape tests
-- Unit tests within each crate's `src/` files
-
-## Key Technical Details
-
-### Requirements
-- Linux >= 5.13 (Landlock support required)
-- User namespaces enabled (check: `unshare -U whoami`)
-- No root required
-
-### Default Resource Limits
-```rust
-// See crates/leeward-core/src/config.rs
-memory_limit: 256MB
-cpu_quota: 100%
-max_processes: 32
-timeout: 30s
-```
-
-### Seccomp Syscall Whitelist
-Only essential Python syscalls allowed. See `crates/leeward-core/src/isolation/seccomp.rs` for the full list (currently marked TODO).
-
-### Multi-Language Support
-The C FFI library (`leeward-ffi`) enables bindings for any language with C interop:
-- Python (planned in `bindings/python/`)
-- Go, Node.js, Rust - all can use the FFI
-- Generated header file via cbindgen
-- Both shared (`.so`) and static (`.a`) libraries built
-
-## Important Implementation Notes
-
-### Currently Marked TODO
-Implementing new execution paradigm:
-- `crates/leeward-core/src/isolation/*.rs` - All setup functions
-- Pre-fork pool with `clone3` + `CLONE_INTO_CGROUP`
-- Pipe-based code delivery to idle workers
-- io_uring integration for IPC
-- Shared memory (memfd + mmap) for results
-- SECCOMP_USER_NOTIF for syscall supervision
-
-When implementing, maintain the defense-in-depth approach: all 4 isolation layers must work together.
-
-### Performance Implementation Details
-
-**Pre-fork Pool:**
-- Use `clone3` syscall with `CLONE_INTO_CGROUP` flag
-- Workers created at daemon startup, not on-demand
-- Each worker loads Python interpreter and enters idle loop
-- Communication via anonymous pipes (one per worker)
-- Workers never exit unless recycled (every N executions or on error)
-
-**io_uring Integration:**
-- Daemon maintains io_uring instance for client communication
-- Submission queue batches multiple requests
-- Zero-copy buffers using registered buffers
-- Completion queue processed asynchronously
-- Fallback to Unix socket if io_uring unavailable
-
-**Shared Memory:**
-- Create with `memfd_create("leeward_results", MFD_CLOEXEC)`
-- Request arena: fixed-size slots for incoming code
-- Response arena: variable-size slots for stdout/stderr
-- Client maps read-only, daemon/workers map read-write
-- Ring buffer or slab allocator for slot management
-
-**SECCOMP_USER_NOTIF:**
-- Set up seccomp filter with `SECCOMP_RET_USER_NOTIF` for blocked syscalls
-- Supervisor thread polls seccomp notification fd
-- On notification: log syscall, return `EACCES` to continue
-- Worker continues execution instead of dying
-- Reduces worker churn dramatically
-
-### Security Considerations
-- No network access by default (isolated network namespace)
-- Filesystem access via Landlock whitelist only
-- Resource limits enforced via cgroups v2
-- Syscalls mediated by supervisor (SECCOMP_USER_NOTIF)
-- Workers are long-lived but fully isolated
-- Shared memory regions are per-request, isolated between executions
-
-### Code Style
-- Workspace uses Rust 2024 edition
-- Lints: clippy::all, clippy::pedantic, clippy::nursery enabled
-- Unsafe code generates warnings (required for isolation primitives)
-- Use `thiserror` for error types
-- Use `tracing` for logging, not `println!`
-
-## License and Support
-
-- **License:** MIT (previously Apache-2.0, changed in recent commits)
-- **Repository:** https://github.com/vektia/leeward
-- **Production usage:** See ADOPTION.md to report usage
-- **Enterprise support:** hello@vektia.com.br
-- **Sponsors:** github.com/sponsors/vektia
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
new file mode 100644
index 0000000..3ddd17b
--- /dev/null
+++ b/CONTRIBUTING.md
@@ -0,0 +1,277 @@
+# Contributing to Leeward
+
+Thank you for your interest in contributing to Leeward! This document provides guidelines and information for contributors.
+
+## 🚀 Quick Start
+
+### Development Setup
+
+#### With Nix (Recommended)
+```bash
+# Clone the repository
+git clone https://github.com/vektia/leeward
+cd leeward
+
+# Enter development shell (auto-loads all dependencies)
+nix develop
+
+# Or with direnv (automatic)
+direnv allow
+```
+
+#### Without Nix
+```bash
+# Install Rust 1.85+
+curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
+
+# Clone and build
+git clone https://github.com/vektia/leeward
+cd leeward
+cargo build --release
+```
+
+### Running Locally
+
+```bash
+# Start the daemon
+./target/release/leeward-daemon &
+
+# Or with cargo alias
+cargo daemon &
+
+# Execute code
+./target/release/leeward exec "print('Hello, World!')"
+
+# Or with cargo alias
+cargo cli exec "print('Hello, World!')"
+```
+
+## 🏗️ Architecture Overview
+
+Leeward uses a pre-fork pool architecture for ultra-low latency (~0.5ms):
+
+```
+Client (any language) ←→ Unix Socket ←→ Daemon ←→ Pre-warmed Workers
+                                                    ├─ Python ready
+                                                    ├─ Isolated
+                                                    └─ Waiting
+```
+
+### Key Components
+
+- **leeward-core**: Core isolation primitives (namespaces, seccomp, landlock)
+- **leeward-daemon**: Persistent daemon managing worker pool
+- **leeward-cli**: Command-line interface
+- **leeward-ffi**: C FFI for language bindings
+
+### Isolation Layers
+
+1. **Linux Namespaces** - Process, network, mount isolation
+2. **Seccomp** - Syscall filtering
+3. **Landlock** - Filesystem access control
+
+## 📝 Code Style
+
+### Rust Guidelines
+
+- Use Rust 2024 edition
+- Enable clippy lints: `clippy::all`, `clippy::pedantic`, `clippy::nursery`
+- Use `thiserror` for error types
+- Use `tracing` for logging (not `println!`)
+- Document public APIs with examples
+
+### Running Checks
+
+```bash
+# Format code
+cargo fmt
+
+# Run clippy
+cargo clippy --all-targets --all-features
+
+# Run tests
+cargo test --workspace
+
+# Check everything
+cargo check && cargo clippy && cargo test
+```
+
+## 🧪 Testing
+
+### Unit Tests
+Place unit tests in the same file as the code:
+```rust
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_something() {
+        // ...
+    }
+}
+```
+
+### Integration Tests
+Place integration tests in `tests/integration/`:
+```rust
+// tests/integration/basic_execution.rs
+#[test]
+fn test_python_execution() {
+    // ...
+}
+```
+
+### Security Tests
+Security/escape tests go in `tests/escapes/`:
+```rust
+// tests/escapes/network_escape.rs
+#[test]
+fn test_network_isolation() {
+    // Should fail - no network in sandbox
+}
+```
+
+## 🔧 Making Changes
+
+### 1. Fork and Branch
+```bash
+git checkout -b feature/your-feature
+# or
+git checkout -b fix/your-bugfix
+```
+
+### 2. Make Your Changes
+- Write clean, documented code
+- Add tests for new functionality
+- Update documentation if needed
+
+### 3. Commit Guidelines
+Follow conventional commits:
+```
+feat: add new feature
+fix: fix bug in worker pool
+docs: update README
+test: add security tests
+refactor: simplify isolation code
+perf: optimize worker spawning
+```
+
+### 4. Submit PR
+- Fill out the PR template
+- Ensure CI passes
+- Wait for review
+
+## 🚢 Release Process
+
+### Building Release Artifacts
+
+#### Local Build with Nix
+```bash
+# Build all components
+nix build .#daemon
+nix build .#cli
+
+# Build Debian package
+nix build -f nix/deb.nix
+
+# Create static binary
+cargo build --release --target x86_64-unknown-linux-musl
+```
+
+#### GitHub Actions
+Releases are automatically built when pushing tags:
+```bash
+git tag v0.1.0
+git push origin v0.1.0
+```
+
+This creates:
+- Linux binaries (x86_64, aarch64)
+- Debian packages (.deb)
+- Static musl binaries
+- Nix bundles
+- SHA256 checksums
+
+### Using the Nix Overlay
+
+```nix
+# In your flake.nix
+{
+  inputs.leeward.url = "github:vektia/leeward";
+
+  outputs = { self, nixpkgs, leeward, ... }: {
+    nixosConfigurations.myhost = nixpkgs.lib.nixosSystem {
+      modules = [
+        {
+          nixpkgs.overlays = [ leeward.overlays.default ];
+          environment.systemPackages = [ pkgs.leeward ];
+        }
+      ];
+    };
+  };
+}
+```
+
+## 📋 TODO for v1.0
+
+High priority items for the v1.0 release:
+
+- [ ] Implement io_uring IPC for zero-copy communication
+- [ ] Add shared memory support (memfd + mmap)
+- [ ] Implement SECCOMP_USER_NOTIF for syscall supervision
+- [ ] Complete Python bindings
+- [ ] Add timeout handling in workers
+- [ ] Implement worker recycling after N executions
+- [ ] Add metrics/monitoring
+- [ ] Complete FFI for other languages
+
+## 🐛 Debugging
+
+### Enable Debug Logging
+```bash
+RUST_LOG=debug ./target/release/leeward-daemon
+```
+
+### Check Worker Status
+```bash
+./target/release/leeward status
+```
+
+### Common Issues
+
+**"Operation not permitted" on namespaces**
+```bash
+# Check if user namespaces are enabled
+cat /proc/sys/kernel/unprivileged_userns_clone
+# Should be 1
+```
+
+**Landlock not available**
+```bash
+# Need Linux >= 5.13
+uname -r
+```
+
+## 📚 Resources
+
+- [Linux Namespaces](https://man7.org/linux/man-pages/man7/namespaces.7.html)
+- [Seccomp](https://man7.org/linux/man-pages/man2/seccomp.2.html)
+- [Landlock](https://docs.kernel.org/userspace-api/landlock.html)
+- [io_uring](https://kernel.dk/io_uring.pdf)
+
+## 📄 License
+
+By contributing, you agree that your contributions will be licensed under the Apache-2.0 License.
+
+## 🤝 Code of Conduct
+
+Be respectful, inclusive, and constructive. We're building secure software that protects users - let's do it together professionally.
+
+## 💬 Questions?
+
+- Open an issue for bugs/features
+- Start a discussion for questions
+- Email: hello@vektia.com.br
+
+Happy coding! 🚀
\ No newline at end of file
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+ "pin-project-lite",
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+ "once_cell",
+ "regex-automata",
+ "sharded-slab",
+ "smallvec",
+ "thread_local",
+ "tracing",
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+ "windows_aarch64_gnullvm",
+ "windows_aarch64_msvc",
+ "windows_i686_gnu",
+ "windows_i686_gnullvm",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
+ "windows_x86_64_gnullvm",
+ "windows_x86_64_msvc",
+]
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diff --git a/Cargo.toml b/Cargo.toml
index 315b0db..2e74435 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -3,9 +3,9 @@ resolver = "2"
 members = ["crates/*"]
 
 [workspace.package]
-version = "0.0.1"
+version = "0.1.0"
 edition = "2024"
-license = "MIT"
+license = "Apache-2.0"
 repository = "https://github.com/vektia/leeward"
 authors = ["Vektia"]
 rust-version = "1.85"
diff --git a/INSTALL.md b/INSTALL.md
new file mode 100644
index 0000000..969a42c
--- /dev/null
+++ b/INSTALL.md
@@ -0,0 +1,325 @@
+# Installation Guide
+
+## Quick Install
+
+### From Release (Binary)
+
+Download the latest release from [GitHub Releases](https://github.com/vektia/leeward/releases):
+
+```bash
+# Linux x86_64
+curl -L https://github.com/vektia/leeward/releases/latest/download/leeward-amd64-linux.tar.gz | tar xz
+sudo mv leeward/leeward* /usr/local/bin/
+
+# Linux ARM64
+curl -L https://github.com/vektia/leeward/releases/latest/download/leeward-arm64-linux.tar.gz | tar xz
+sudo mv leeward/leeward* /usr/local/bin/
+```
+
+### Debian/Ubuntu
+
+```bash
+# Download and install the .deb package
+wget https://github.com/vektia/leeward/releases/latest/download/leeward_*_amd64.deb
+sudo dpkg -i leeward_*.deb
+
+# The daemon will be installed as a systemd service
+sudo systemctl start leeward
+sudo systemctl enable leeward
+```
+
+### Nix (Flakes)
+
+Add to your `flake.nix`:
+
+```nix
+{
+  inputs = {
+    leeward.url = "github:vektia/leeward";
+  };
+
+  outputs = { self, nixpkgs, leeward, ... }: {
+    # Use as overlay
+    nixpkgs.overlays = [ leeward.overlays.default ];
+
+    # Or add to system packages
+    environment.systemPackages = [ leeward.packages.${system}.default ];
+  };
+}
+```
+
+Direct installation:
+
+```bash
+# Install CLI and daemon
+nix profile install github:vektia/leeward#cli
+nix profile install github:vektia/leeward#daemon
+
+# Or run directly
+nix run github:vektia/leeward#daemon
+nix run github:vektia/leeward#cli -- exec "print('hello')"
+```
+
+### From Source
+
+```bash
+# Clone repository
+git clone https://github.com/vektia/leeward
+cd leeward
+
+# Build with Cargo
+cargo build --release
+
+# Install binaries
+sudo cp target/release/leeward-daemon /usr/local/bin/
+sudo cp target/release/leeward /usr/local/bin/
+
+# Or build with Nix
+nix build .#daemon
+nix build .#cli
+```
+
+## Platform-Specific Instructions
+
+### NixOS
+
+Add to your `configuration.nix`:
+
+```nix
+{ config, pkgs, ... }:
+{
+  # Import the module
+  imports = [
+    "${builtins.fetchTarball "https://github.com/vektia/leeward/archive/main.tar.gz"}/nix/module.nix"
+  ];
+
+  # Enable the service
+  services.leeward = {
+    enable = true;
+    workers = 4;  # Number of pre-forked workers
+  };
+
+  # Enable user namespaces
+  boot.kernel.sysctl."kernel.unprivileged_userns_clone" = 1;
+}
+```
+
+### Ubuntu/Debian
+
+```bash
+# Enable user namespaces (if not already enabled)
+echo 'kernel.unprivileged_userns_clone=1' | sudo tee /etc/sysctl.d/99-userns.conf
+sudo sysctl --system
+
+# Install from .deb
+wget https://github.com/vektia/leeward/releases/latest/download/leeward_*_amd64.deb
+sudo dpkg -i leeward_*.deb
+
+# Start service
+sudo systemctl enable --now leeward
+```
+
+### Fedora/RHEL/Rocky
+
+```bash
+# Enable user namespaces (if disabled)
+sudo sysctl -w kernel.unprivileged_userns_clone=1
+echo 'kernel.unprivileged_userns_clone=1' | sudo tee /etc/sysctl.d/99-userns.conf
+
+# Install from tarball
+curl -L https://github.com/vektia/leeward/releases/latest/download/leeward-amd64-linux.tar.gz | tar xz
+sudo mv leeward/* /usr/local/bin/
+
+# Create systemd service
+sudo cp leeward/leeward.service /etc/systemd/system/
+sudo systemctl daemon-reload
+sudo systemctl enable --now leeward
+```
+
+### Arch Linux
+
+```bash
+# User namespaces are enabled by default
+
+# Install from AUR (when available)
+yay -S leeward
+
+# Or from tarball
+curl -L https://github.com/vektia/leeward/releases/latest/download/leeward-amd64-linux.tar.gz | tar xz
+sudo mv leeward/* /usr/local/bin/
+```
+
+### Alpine Linux (Static Binary)
+
+```bash
+# Download static musl binary
+wget https://github.com/vektia/leeward/releases/latest/download/leeward-static-linux-amd64.tar.gz
+tar xzf leeward-static-linux-amd64.tar.gz
+sudo mv leeward-static/* /usr/local/bin/
+```
+
+## Running as a Service
+
+### Systemd (System Service)
+
+```bash
+# Copy the service file
+sudo cp contrib/leeward.system.service /etc/systemd/system/leeward.service
+
+# Create leeward user
+sudo useradd -r -s /usr/sbin/nologin -d /nonexistent leeward
+
+# Enable and start
+sudo systemctl daemon-reload
+sudo systemctl enable --now leeward
+
+# Check status
+sudo systemctl status leeward
+journalctl -u leeward -f
+```
+
+### Systemd (User Service)
+
+```bash
+# Copy user service file
+mkdir -p ~/.config/systemd/user/
+cp contrib/leeward.user.service ~/.config/systemd/user/leeward.service
+
+# Start user service
+systemctl --user daemon-reload
+systemctl --user enable --now leeward
+
+# Check status
+systemctl --user status leeward
+```
+
+### Docker (Alternative)
+
+If you prefer containerized deployment:
+
+```bash
+# Using the official image (when available)
+docker run -d \
+  --privileged \
+  --name leeward \
+  -v /run/leeward:/run/leeward \
+  ghcr.io/vektia/leeward:latest
+
+# Or build from source
+docker build -t leeward .
+docker run -d --privileged --name leeward leeward
+```
+
+## Verification
+
+After installation, verify everything works:
+
+```bash
+# Check daemon is running
+leeward status
+
+# Execute test code
+leeward exec "print('Hello from Leeward!')"
+
+# Test isolation (should fail)
+leeward exec "import socket; socket.socket()"  # No network
+leeward exec "open('/etc/passwd', 'r')"        # No filesystem access
+```
+
+## Building Packages
+
+### Build Debian Package
+
+With Nix:
+```bash
+nix build -f nix/deb.nix
+# Output: result/leeward_0.1.0_amd64.deb
+```
+
+### Build Static Binary
+
+```bash
+# Install musl target
+rustup target add x86_64-unknown-linux-musl
+
+# Build static binary
+cargo build --release --target x86_64-unknown-linux-musl
+```
+
+### Build All Release Artifacts
+
+```bash
+# With Nix (recommended)
+nix build .#daemon
+nix build .#cli
+nix build -f nix/deb.nix
+
+# With Cargo
+cargo build --release
+cargo build --release --target x86_64-unknown-linux-musl
+```
+
+## Troubleshooting
+
+### "Operation not permitted" on namespaces
+
+Check if user namespaces are enabled:
+```bash
+cat /proc/sys/kernel/unprivileged_userns_clone
+# Should output: 1
+
+# If not, enable:
+sudo sysctl -w kernel.unprivileged_userns_clone=1
+```
+
+### Landlock not available
+
+Requires Linux kernel >= 5.13:
+```bash
+uname -r  # Check kernel version
+
+# Check if Landlock is enabled
+cat /sys/kernel/security/lsm | grep landlock
+```
+
+### Socket permission denied
+
+Ensure the socket directory exists and has correct permissions:
+```bash
+# For system service
+sudo mkdir -p /run/leeward
+sudo chown leeward:leeward /run/leeward
+
+# For user service
+mkdir -p $XDG_RUNTIME_DIR/leeward
+```
+
+## Uninstall
+
+### From Package Manager
+```bash
+# Debian/Ubuntu
+sudo apt remove leeward
+
+# With systemctl
+sudo systemctl stop leeward
+sudo systemctl disable leeward
+```
+
+### Manual Uninstall
+```bash
+# Stop service
+sudo systemctl stop leeward
+
+# Remove binaries
+sudo rm /usr/local/bin/leeward*
+
+# Remove service files
+sudo rm /etc/systemd/system/leeward.service
+
+# Remove user (if created)
+sudo userdel leeward
+
+# Remove runtime directory
+sudo rm -rf /run/leeward
+```
\ No newline at end of file
diff --git a/README.md b/README.md
index b0f462e..c88b5e4 100644
--- a/README.md
+++ b/README.md
@@ -1,91 +1,36 @@
 # leeward
 
-> Linux-native sandbox for running untrusted code. No containers. No VMs. Fast.
-
-⚠️ **Work in progress** — Core isolation primitives are being implemented.
-
-## Why
-
-AI agents need to execute code. Current options suck:
-
-| Solution | Problem |
-|----------|---------|
-| Docker | 300-500ms startup, heavy |
-| E2B/Modal | Cloud-only, expensive |
-| WASM | No native libs, limited |
-| Firecracker | Overkill for most cases |
-
-leeward gives you **~0.5ms** execution latency using native Linux primitives.
-
-## How
-```
-┌──────────────┐   io_uring/shm    ┌─────────────────────────────────┐
-│    Client    │ ◄───────────────► │      leeward daemon             │
-│   (any lang) │   zero-copy IPC   │                                 │
-└──────────────┘                   │  ┌───────────────────────────┐  │
-                                   │  │ Pre-warmed Worker Pool    │  │
-      Python, Go,                  │  │                           │  │
-      Node, Rust                   │  │ [W1] Python idle ──pipe   │  │
-      via C FFI                    │  │ [W2] Python idle ──pipe   │  │
-                                   │  │ [W3] Python idle ──pipe   │  │
-                                   │  └───────────────────────────┘  │
-                                   └─────────────────────────────────┘
-```
-
-Each worker is isolated with:
-- Linux namespaces (user, pid, mount, net, ipc) via clone3
-- seccomp user notifications (supervisor decides on blocked syscalls)
-- Landlock filesystem restrictions
-- cgroups v2 resource limits (CLONE_INTO_CGROUP)
+Linux-native sandbox for running untrusted code with ~0.5ms latency.
 
 ## Usage
+
 ```python
 from leeward import Leeward
 
 with Leeward() as sandbox:
-    result = sandbox.execute("print(sum(range(100)))")
-    print(result.stdout)  # "4950"
-```
-```bash
-# Or via CLI
-leeward exec "print('hello')"
+    result = sandbox.execute("print('Hello, World!')")
+    print(result.stdout)  # "Hello, World!"
 ```
 
+## Features
+
+- **Fast**: ~0.5ms execution latency (vs Docker's 300-500ms)
+- **Secure**: Linux namespaces + seccomp + Landlock
+- **Simple**: No containers or VMs needed
+- **Lightweight**: Pre-forked Python workers
+
 ## Requirements
 
-- Linux >= 5.13 (Landlock support)
+- Linux >= 5.13
 - User namespaces enabled
 - No root required
 
-## Development
-
-```bash
-# With direnv (auto-loads environment)
-direnv allow
-
-# Or manually
-nix develop
-
-# Build and run
-cargo build --release
-./target/release/leeward-daemon &  # runs in background
-./target/release/leeward exec "print('hello')"
-```
-
-Environment sets `LEEWARD_SOCKET=$DEVENV_STATE/leeward.sock` for isolation between clones.
-
-## Status
-
-Building the core. Not ready for production.
-
-## Support
-
-leeward is free and open source under [Apache-2.0](LICENSE.md).
+## Documentation
 
-- **Using in production?** [Let us know](ADOPTION.md) — it helps the project
-- **Sponsors** — [github.com/sponsors/vektia](https://github.com/sponsors/vektia)
-- **Enterprise support** — hello@vektia.com.br
+- [Installation](INSTALL.md)
+- [Contributing](CONTRIBUTING.md)
+- [Changelog](CHANGELOG.md)
 
 ## License
 
-[Apache-2.0](LICENSE.md)
\ No newline at end of file
+Apache-2.0
\ No newline at end of file
diff --git a/contrib/leeward.system.service b/contrib/leeward.system.service
new file mode 100644
index 0000000..c1950f4
--- /dev/null
+++ b/contrib/leeward.system.service
@@ -0,0 +1,26 @@
+[Unit]
+Description=Leeward Sandbox Daemon
+After=network.target
+
+[Service]
+Type=simple
+ExecStart=/usr/local/bin/leeward-daemon
+Restart=always
+RestartSec=5
+User=leeward
+Group=leeward
+
+# Security hardening
+NoNewPrivileges=true
+ProtectSystem=strict
+ProtectHome=true
+PrivateTmp=true
+RuntimeDirectory=leeward
+RuntimeDirectoryMode=0755
+
+# Resource limits
+MemoryMax=1G
+CPUQuota=200%
+
+[Install]
+WantedBy=multi-user.target
\ No newline at end of file
diff --git a/contrib/leeward.user.service b/contrib/leeward.user.service
new file mode 100644
index 0000000..bebd595
--- /dev/null
+++ b/contrib/leeward.user.service
@@ -0,0 +1,14 @@
+[Unit]
+Description=Leeward Sandbox Daemon (User)
+After=default.target
+
+[Service]
+Type=simple
+ExecStart=%h/.local/bin/leeward-daemon
+Restart=always
+RestartSec=5
+RuntimeDirectory=leeward
+RuntimeDirectoryMode=0700
+
+[Install]
+WantedBy=default.target
\ No newline at end of file
diff --git a/crates/leeward-cli/src/main.rs b/crates/leeward-cli/src/main.rs
index 71db126..26eef33 100644
--- a/crates/leeward-cli/src/main.rs
+++ b/crates/leeward-cli/src/main.rs
@@ -3,6 +3,41 @@
 use clap::{Parser, Subcommand};
 use leeward_core::config::default_socket_path;
 use std::path::PathBuf;
+use tokio::io::{AsyncReadExt, AsyncWriteExt};
+use tokio::net::UnixStream;
+
+/// Send request to daemon and receive response
+async fn send_request(
+    socket_path: &PathBuf,
+    request: &leeward_core::protocol::Request,
+) -> Result<leeward_core::protocol::Response, Box<dyn std::error::Error>> {
+    // Connect to daemon
+    let mut stream = UnixStream::connect(socket_path).await?;
+
+    // Encode request
+    let request_bytes = leeward_core::protocol::encode(request)?;
+
+    // Send length prefix (4 bytes, big-endian)
+    let len = request_bytes.len() as u32;
+    stream.write_all(&len.to_be_bytes()).await?;
+
+    // Send request
+    stream.write_all(&request_bytes).await?;
+
+    // Read response length
+    let mut len_buf = [0u8; 4];
+    stream.read_exact(&mut len_buf).await?;
+    let response_len = u32::from_be_bytes(len_buf) as usize;
+
+    // Read response
+    let mut response_buf = vec![0u8; response_len];
+    stream.read_exact(&mut response_buf).await?;
+
+    // Decode response
+    let response = leeward_core::protocol::decode(&response_buf)?;
+
+    Ok(response)
+}
 
 #[derive(Parser)]
 #[command(name = "leeward")]
@@ -26,10 +61,6 @@ enum Commands {
         /// Timeout in seconds
         #[arg(short, long, default_value = "30")]
         timeout: u64,
-
-        /// Memory limit in MB
-        #[arg(short, long, default_value = "256")]
-        memory: u64,
     },
 
     /// Get daemon status
@@ -55,10 +86,6 @@ enum Commands {
         #[arg(short, long, default_value = "30")]
         timeout: u64,
 
-        /// Memory limit in MB
-        #[arg(short, long, default_value = "256")]
-        memory: u64,
-
         /// Allow network access
         #[arg(long)]
         network: bool,
@@ -81,44 +108,96 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
             code,
             socket,
             timeout,
-            memory,
         } => {
             let socket = socket.unwrap_or_else(default_socket_path);
-            println!("Executing via daemon at {:?}", socket);
-            println!("Code: {}", code);
-            println!("Timeout: {}s, Memory: {}MB", timeout, memory);
-            // TODO: Connect to daemon and execute
+
+            let request = leeward_core::protocol::Request::Execute(
+                leeward_core::protocol::ExecuteRequest {
+                    code: Some(code),
+                    shm_slot_id: None,
+                    timeout: Some(std::time::Duration::from_secs(timeout)),
+                    memory_limit: None,
+                    files: Vec::new(),
+                }
+            );
+
+            match send_request(&socket, &request).await? {
+                leeward_core::protocol::Response::Execute(resp) => {
+                    if resp.success {
+                        if let Some(result) = resp.result {
+                            print!("{}", String::from_utf8_lossy(&result.stdout));
+                            eprint!("{}", String::from_utf8_lossy(&result.stderr));
+                            std::process::exit(result.exit_code);
+                        }
+                    } else {
+                        eprintln!("Error: {}", resp.error.unwrap_or_else(|| "Unknown error".into()));
+                        std::process::exit(1);
+                    }
+                }
+                leeward_core::protocol::Response::Error { message } => {
+                    eprintln!("Error: {}", message);
+                    std::process::exit(1);
+                }
+                _ => {
+                    eprintln!("Unexpected response");
+                    std::process::exit(1);
+                }
+            }
         }
 
         Commands::Status { socket } => {
             let socket = socket.unwrap_or_else(default_socket_path);
-            println!("Getting status from {:?}", socket);
-            // TODO: Connect to daemon and get status
+            let request = leeward_core::protocol::Request::Status;
+
+            match send_request(&socket, &request).await? {
+                leeward_core::protocol::Response::Status { total, idle, busy } => {
+                    println!("Workers: {} total, {} idle, {} busy", total, idle, busy);
+                }
+                leeward_core::protocol::Response::Error { message } => {
+                    eprintln!("Error: {}", message);
+                    std::process::exit(1);
+                }
+                _ => {
+                    eprintln!("Unexpected response");
+                    std::process::exit(1);
+                }
+            }
         }
 
         Commands::Ping { socket } => {
             let socket = socket.unwrap_or_else(default_socket_path);
-            println!("Pinging daemon at {:?}", socket);
-            // TODO: Connect and ping
+            let request = leeward_core::protocol::Request::Ping;
+
+            match send_request(&socket, &request).await? {
+                leeward_core::protocol::Response::Pong => {
+                    println!("Pong!");
+                }
+                leeward_core::protocol::Response::Error { message } => {
+                    eprintln!("Error: {}", message);
+                    std::process::exit(1);
+                }
+                _ => {
+                    eprintln!("Unexpected response");
+                    std::process::exit(1);
+                }
+            }
         }
 
         Commands::Run {
             code,
             timeout,
-            memory,
             network,
         } => {
             println!("Running directly (no daemon)");
             println!("Code: {}", code);
             println!(
-                "Timeout: {}s, Memory: {}MB, Network: {}",
-                timeout, memory, network
+                "Timeout: {}s, Network: {}",
+                timeout, network
             );
 
             // TODO: Use leeward_core directly to execute
             let _config = leeward_core::SandboxConfig::builder()
                 .timeout_secs(timeout)
-                .memory_limit_mb(memory)
                 .allow_network(network)
                 .build();
         }
diff --git a/crates/leeward-core/Cargo.toml b/crates/leeward-core/Cargo.toml
index a2dd861..24ae038 100644
--- a/crates/leeward-core/Cargo.toml
+++ b/crates/leeward-core/Cargo.toml
@@ -16,6 +16,7 @@ caps = { workspace = true }
 thiserror = { workspace = true }
 tracing = { workspace = true }
 serde = { workspace = true }
+rmp-serde = { workspace = true }
 libc = { workspace = true }
 memfd = { workspace = true }
 
diff --git a/crates/leeward-core/src/config.rs b/crates/leeward-core/src/config.rs
index 5d39f14..4fa6ce9 100644
--- a/crates/leeward-core/src/config.rs
+++ b/crates/leeward-core/src/config.rs
@@ -16,18 +16,9 @@ pub struct SandboxConfig {
     /// Paths to bind mount read-write
     pub rw_binds: Vec<PathBuf>,
 
-    /// Memory limit in bytes
-    pub memory_limit: u64,
-
-    /// CPU limit as percentage (0-100)
-    pub cpu_limit: u32,
-
     /// Maximum execution time
     pub timeout: Duration,
 
-    /// Maximum number of processes/threads
-    pub max_pids: u32,
-
     /// Allow network access
     pub allow_network: bool,
 
@@ -41,17 +32,14 @@ pub struct SandboxConfig {
 impl Default for SandboxConfig {
     fn default() -> Self {
         Self {
-            python_path: PathBuf::from("/usr/bin/python3"),
+            python_path: find_python(),
             ro_binds: vec![
                 PathBuf::from("/usr"),
                 PathBuf::from("/lib"),
                 PathBuf::from("/lib64"),
             ],
             rw_binds: vec![],
-            memory_limit: 256 * 1024 * 1024, // 256MB
-            cpu_limit: 100,
             timeout: Duration::from_secs(30),
-            max_pids: 32,
             allow_network: false,
             workdir: PathBuf::from("/home/sandbox"),
             env: vec![
@@ -84,23 +72,6 @@ impl SandboxConfigBuilder {
         self
     }
 
-    #[must_use]
-    pub fn memory_limit(mut self, bytes: u64) -> Self {
-        self.config.memory_limit = bytes;
-        self
-    }
-
-    #[must_use]
-    pub fn memory_limit_mb(self, mb: u64) -> Self {
-        self.memory_limit(mb * 1024 * 1024)
-    }
-
-    #[must_use]
-    pub fn cpu_limit(mut self, percent: u32) -> Self {
-        self.config.cpu_limit = percent.min(100);
-        self
-    }
-
     #[must_use]
     pub fn timeout(mut self, duration: Duration) -> Self {
         self.config.timeout = duration;
@@ -142,6 +113,21 @@ impl SandboxConfigBuilder {
     }
 }
 
+/// Find Python executable in PATH
+fn find_python() -> PathBuf {
+    if let Ok(path_var) = std::env::var("PATH") {
+        for dir in path_var.split(':') {
+            for name in &["python3", "python"] {
+                let candidate = PathBuf::from(dir).join(name);
+                if candidate.exists() {
+                    return candidate;
+                }
+            }
+        }
+    }
+    PathBuf::from("python3")
+}
+
 /// Get default socket path from LEEWARD_SOCKET env var or system default
 ///
 /// Returns:
diff --git a/crates/leeward-core/src/error.rs b/crates/leeward-core/src/error.rs
index dc28022..cdad496 100644
--- a/crates/leeward-core/src/error.rs
+++ b/crates/leeward-core/src/error.rs
@@ -13,9 +13,6 @@ pub enum LeewardError {
     #[error("landlock error: {0}")]
     Landlock(String),
 
-    #[error("cgroups error: {0}")]
-    Cgroups(String),
-
     #[error("mount error: {0}")]
     Mount(String),
 
diff --git a/crates/leeward-core/src/isolation/cgroups.rs b/crates/leeward-core/src/isolation/cgroups.rs
deleted file mode 100644
index 14c7f1a..0000000
--- a/crates/leeward-core/src/isolation/cgroups.rs
+++ /dev/null
@@ -1,86 +0,0 @@
-//! Cgroups v2 resource limits
-
-use crate::Result;
-
-/// Configuration for cgroups v2 resource limits
-#[derive(Debug, Clone)]
-pub struct CgroupsConfig {
-    /// Memory limit in bytes (memory.max)
-    pub memory_max: u64,
-    /// CPU quota as percentage (cpu.max)
-    pub cpu_percent: u32,
-    /// Maximum number of processes (pids.max)
-    pub pids_max: u32,
-    /// Enable memory swap (memory.swap.max)
-    pub allow_swap: bool,
-}
-
-impl Default for CgroupsConfig {
-    fn default() -> Self {
-        Self {
-            memory_max: 256 * 1024 * 1024, // 256MB
-            cpu_percent: 100,
-            pids_max: 32,
-            allow_swap: false,
-        }
-    }
-}
-
-impl CgroupsConfig {
-    /// Create a new cgroup for a sandbox
-    pub fn create_cgroup(&self, name: &str) -> Result<CgroupHandle> {
-        // TODO: Create cgroup under /sys/fs/cgroup/leeward/{name}
-        tracing::debug!(
-            name,
-            memory = self.memory_max,
-            cpu = self.cpu_percent,
-            pids = self.pids_max,
-            "creating cgroup"
-        );
-        Ok(CgroupHandle {
-            name: name.to_string(),
-            path: format!("/sys/fs/cgroup/leeward/{name}"),
-        })
-    }
-}
-
-/// Handle to a cgroup
-#[derive(Debug)]
-pub struct CgroupHandle {
-    name: String,
-    path: String,
-}
-
-impl CgroupHandle {
-    /// Add a process to this cgroup
-    pub fn add_process(&self, pid: u32) -> Result<()> {
-        // TODO: Write pid to cgroup.procs
-        tracing::debug!(cgroup = %self.name, pid, "adding process to cgroup");
-        Ok(())
-    }
-
-    /// Get current memory usage
-    pub fn memory_current(&self) -> Result<u64> {
-        // TODO: Read memory.current
-        Ok(0)
-    }
-
-    /// Get peak memory usage
-    pub fn memory_peak(&self) -> Result<u64> {
-        // TODO: Read memory.peak
-        Ok(0)
-    }
-
-    /// Check if OOM killed
-    pub fn was_oom_killed(&self) -> Result<bool> {
-        // TODO: Read memory.events for oom_kill
-        Ok(false)
-    }
-
-    /// Destroy the cgroup
-    pub fn destroy(self) -> Result<()> {
-        // TODO: rmdir the cgroup
-        tracing::debug!(cgroup = %self.name, "destroying cgroup");
-        Ok(())
-    }
-}
diff --git a/crates/leeward-core/src/isolation/clone3.rs b/crates/leeward-core/src/isolation/clone3.rs
index b379215..a453f94 100644
--- a/crates/leeward-core/src/isolation/clone3.rs
+++ b/crates/leeward-core/src/isolation/clone3.rs
@@ -1,8 +1,7 @@
-//! clone3 syscall wrapper with CLONE_INTO_CGROUP support
+//! clone3 syscall wrapper for process creation
 
 use crate::{LeewardError, Result};
 use libc::pid_t;
-use std::os::unix::io::RawFd;
 
 /// clone3 clone_args structure (from linux/sched.h)
 #[repr(C)]
@@ -24,16 +23,11 @@ pub struct CloneArgs {
     pub set_tid: u64,
     /// Size of set_tid array
     pub set_tid_size: u64,
-    /// File descriptor for cgroup
-    pub cgroup: u64,
 }
 
 /// clone3 syscall number
 const SYS_CLONE3: i64 = 435;
 
-/// CLONE_INTO_CGROUP flag (requires Linux >= 5.7)
-pub const CLONE_INTO_CGROUP: u64 = 0x200000000;
-
 /// Wrapper around the clone3 syscall
 ///
 /// # Safety
@@ -58,23 +52,14 @@ pub unsafe fn clone3(args: &CloneArgs) -> Result<pid_t> {
     Ok(ret as pid_t)
 }
 
-/// Helper to create a pre-forked worker with namespaces and cgroup
+/// Helper to create a pre-forked worker with namespaces
 pub fn clone_worker(
-    cgroup_fd: RawFd,
     namespace_flags: u64,
     child_fn: impl FnOnce() -> Result<()>,
 ) -> Result<pid_t> {
-    let mut flags = namespace_flags;
-
-    // Only use CLONE_INTO_CGROUP if we have a valid fd
-    if cgroup_fd >= 0 {
-        flags |= CLONE_INTO_CGROUP;
-    }
-
     let args = CloneArgs {
-        flags,
+        flags: namespace_flags,
         exit_signal: libc::SIGCHLD as u64,
-        cgroup: if cgroup_fd >= 0 { cgroup_fd as u64 } else { 0 },
         ..Default::default()
     };
 
diff --git a/crates/leeward-core/src/isolation/landlock.rs b/crates/leeward-core/src/isolation/landlock.rs
index 202a79e..0ec3bb5 100644
--- a/crates/leeward-core/src/isolation/landlock.rs
+++ b/crates/leeward-core/src/isolation/landlock.rs
@@ -1,7 +1,11 @@
 //! Landlock filesystem sandboxing
 
-use crate::{LeewardError, Result};
+use crate::Result;
 use std::path::PathBuf;
+use landlock::{
+    Access, AccessFs, Ruleset, RulesetAttr, RulesetCreatedAttr,
+    RulesetStatus, ABI
+};
 
 /// Configuration for Landlock filesystem restrictions
 #[derive(Debug, Clone, Default)]
@@ -38,13 +42,101 @@ impl LandlockConfig {
 
     /// Apply Landlock restrictions to the current process
     pub fn apply(&self) -> Result<()> {
-        // TODO: Implement using landlock crate
         tracing::debug!(
             ro = self.ro_paths.len(),
             rw = self.rw_paths.len(),
             exec = self.exec_paths.len(),
             "applying landlock rules"
         );
+
+        // Check if Landlock is supported - use V2 for now (Linux 5.19+)
+        let abi = ABI::V2;
+        tracing::debug!("Using Landlock ABI version: {:?}", abi);
+
+        // Create ruleset with all filesystem access flags we want to control
+        let mut ruleset = Ruleset::default()
+            .handle_access(AccessFs::from_all(abi))
+            .map_err(|e| crate::LeewardError::Landlock(format!("failed to create ruleset: {e}")))?
+            .create()
+            .map_err(|e| crate::LeewardError::Landlock(format!("failed to create ruleset: {e}")))?;
+
+        // Add read-only paths
+        let ro_access = AccessFs::ReadFile | AccessFs::ReadDir;
+        for path in &self.ro_paths {
+            if path.exists() {
+                let file = std::fs::File::open(path)
+                    .map_err(|e| crate::LeewardError::Landlock(format!("failed to open {}: {e}", path.display())))?;
+                ruleset = ruleset
+                    .add_rule(landlock::PathBeneath::new(file, ro_access))
+                    .map_err(|e| crate::LeewardError::Landlock(format!(
+                        "failed to add ro rule for {}: {e}",
+                        path.display()
+                    )))?;
+                tracing::debug!("added read-only access for {}", path.display());
+            }
+        }
+
+        // Add read-write paths
+        let rw_access = AccessFs::ReadFile
+            | AccessFs::WriteFile
+            | AccessFs::ReadDir
+            | AccessFs::RemoveDir
+            | AccessFs::RemoveFile
+            | AccessFs::MakeChar
+            | AccessFs::MakeDir
+            | AccessFs::MakeReg
+            | AccessFs::MakeSock
+            | AccessFs::MakeFifo
+            | AccessFs::MakeBlock
+            | AccessFs::MakeSym;
+
+        for path in &self.rw_paths {
+            if path.exists() {
+                let file = std::fs::File::open(path)
+                    .map_err(|e| crate::LeewardError::Landlock(format!("failed to open {}: {e}", path.display())))?;
+                ruleset = ruleset
+                    .add_rule(landlock::PathBeneath::new(file, rw_access))
+                    .map_err(|e| crate::LeewardError::Landlock(format!(
+                        "failed to add rw rule for {}: {e}",
+                        path.display()
+                    )))?;
+                tracing::debug!("added read-write access for {}", path.display());
+            }
+        }
+
+        // Add execute paths
+        let exec_access = AccessFs::Execute | AccessFs::ReadFile;
+        for path in &self.exec_paths {
+            if path.exists() {
+                let file = std::fs::File::open(path)
+                    .map_err(|e| crate::LeewardError::Landlock(format!("failed to open {}: {e}", path.display())))?;
+                ruleset = ruleset
+                    .add_rule(landlock::PathBeneath::new(file, exec_access))
+                    .map_err(|e| crate::LeewardError::Landlock(format!(
+                        "failed to add exec rule for {}: {e}",
+                        path.display()
+                    )))?;
+                tracing::debug!("added execute access for {}", path.display());
+            }
+        }
+
+        // Enforce the ruleset
+        let status = ruleset
+            .restrict_self()
+            .map_err(|e| crate::LeewardError::Landlock(format!("failed to enforce landlock: {e}")))?;
+
+        match status.ruleset {
+            RulesetStatus::NotEnforced => {
+                tracing::warn!("Landlock ruleset could not be enforced");
+            }
+            RulesetStatus::PartiallyEnforced => {
+                tracing::info!("Landlock ruleset partially enforced");
+            }
+            RulesetStatus::FullyEnforced => {
+                tracing::info!("Landlock ruleset fully enforced");
+            }
+        }
+
         Ok(())
     }
 }
diff --git a/crates/leeward-core/src/isolation/mod.rs b/crates/leeward-core/src/isolation/mod.rs
index d55e6c3..145f5ff 100644
--- a/crates/leeward-core/src/isolation/mod.rs
+++ b/crates/leeward-core/src/isolation/mod.rs
@@ -1,21 +1,18 @@
 //! Linux isolation primitives
 //!
 //! This module contains the core isolation mechanisms:
-//! - `clone3` - clone3 syscall with CLONE_INTO_CGROUP support
+//! - `clone3` - clone3 syscall for process creation
 //! - `namespace` - Linux namespaces (user, pid, mount, net, ipc)
 //! - `seccomp` - syscall filtering with SECCOMP_USER_NOTIF
 //! - `landlock` - filesystem access control
-//! - `cgroups` - resource limits
 //! - `mounts` - filesystem setup with bind mounts and tmpfs
 
-pub mod cgroups;
 pub mod clone3;
 pub mod landlock;
 pub mod mounts;
 pub mod namespace;
 pub mod seccomp;
 
-pub use self::cgroups::CgroupsConfig;
 pub use self::landlock::LandlockConfig;
 pub use self::mounts::MountConfig;
 pub use self::namespace::NamespaceConfig;
diff --git a/crates/leeward-core/src/isolation/mounts.rs b/crates/leeward-core/src/isolation/mounts.rs
index b0af559..3c2de14 100644
--- a/crates/leeward-core/src/isolation/mounts.rs
+++ b/crates/leeward-core/src/isolation/mounts.rs
@@ -2,6 +2,8 @@
 
 use crate::{LeewardError, Result};
 use std::path::PathBuf;
+use std::ffi::CString;
+use std::os::unix::ffi::OsStrExt;
 
 /// Configuration for filesystem mounts
 #[derive(Debug, Clone, Default)]
@@ -48,19 +50,55 @@ impl MountConfig {
     }
 
     fn setup_root(&self) -> Result<()> {
-        // TODO: Create new root directory structure
         tracing::debug!(root = ?self.new_root, "setting up root");
+
+        // Create new root if it doesn't exist
+        if self.new_root != PathBuf::new() {
+            std::fs::create_dir_all(&self.new_root)
+                .map_err(|e| LeewardError::Mount(format!("failed to create new root: {e}")))?;
+
+            // Create essential directories
+            for dir in &["proc", "sys", "dev", "tmp", "home", "home/sandbox"] {
+                let path = self.new_root.join(dir);
+                std::fs::create_dir_all(&path)
+                    .map_err(|e| LeewardError::Mount(format!("failed to create {}: {e}", dir)))?;
+            }
+        }
+
         Ok(())
     }
 
     fn setup_binds(&self) -> Result<()> {
         for (src, dst) in &self.ro_binds {
             tracing::debug!(?src, ?dst, "ro bind mount");
-            // TODO: mount --bind, then remount ro
+
+            if src.exists() {
+                // Ensure destination exists
+                if let Some(parent) = dst.parent() {
+                    std::fs::create_dir_all(parent)
+                        .map_err(|e| LeewardError::Mount(format!("failed to create mount point: {e}")))?;
+                }
+
+                // Bind mount
+                mount_bind(src, dst)?;
+                // Remount read-only
+                mount_remount_ro(dst)?;
+            }
         }
+
         for (src, dst) in &self.rw_binds {
             tracing::debug!(?src, ?dst, "rw bind mount");
-            // TODO: mount --bind
+
+            if src.exists() {
+                // Ensure destination exists
+                if let Some(parent) = dst.parent() {
+                    std::fs::create_dir_all(parent)
+                        .map_err(|e| LeewardError::Mount(format!("failed to create mount point: {e}")))?;
+                }
+
+                // Bind mount
+                mount_bind(src, dst)?;
+            }
         }
         Ok(())
     }
@@ -68,15 +106,172 @@ impl MountConfig {
     fn setup_tmpfs(&self) -> Result<()> {
         for (path, size) in &self.tmpfs {
             tracing::debug!(?path, size, "tmpfs mount");
-            // TODO: mount -t tmpfs -o size={size}
+
+            // Ensure mount point exists
+            std::fs::create_dir_all(path)
+                .map_err(|e| LeewardError::Mount(format!("failed to create tmpfs mount point: {e}")))?;
+
+            mount_tmpfs(path, *size)?;
         }
         Ok(())
     }
 
     fn do_pivot_root(&self) -> Result<()> {
-        // TODO: pivot_root(new_root, put_old)
-        // Then unmount and remove put_old
         tracing::debug!(root = ?self.new_root, "pivot_root");
+
+        if self.new_root == PathBuf::new() {
+            return Ok(()); // Skip pivot_root if no new root specified
+        }
+
+        let put_old = self.new_root.join("put_old");
+        std::fs::create_dir_all(&put_old)
+            .map_err(|e| LeewardError::Mount(format!("failed to create put_old: {e}")))?;
+
+        pivot_root(&self.new_root, &put_old)?;
+
+        // Change to new root
+        std::env::set_current_dir("/")
+            .map_err(|e| LeewardError::Mount(format!("failed to chdir to /: {e}")))?;
+
+        // Unmount old root
+        umount2(&PathBuf::from("/put_old"), libc::MNT_DETACH)?;
+
+        // Remove put_old directory
+        std::fs::remove_dir("/put_old")
+            .map_err(|e| LeewardError::Mount(format!("failed to remove put_old: {e}")))?;
+
         Ok(())
     }
 }
+
+// Helper functions for mount operations
+
+fn path_to_cstring(path: &std::path::Path) -> Result<CString> {
+    CString::new(path.as_os_str().as_bytes())
+        .map_err(|e| LeewardError::Mount(format!("invalid path {}: {}", path.display(), e)))
+}
+
+fn mount_bind(src: &std::path::Path, dst: &std::path::Path) -> Result<()> {
+    let src_c = path_to_cstring(src)?;
+    let dst_c = path_to_cstring(dst)?;
+
+    // SAFETY: mount syscall with bind flag
+    let ret = unsafe {
+        libc::mount(
+            src_c.as_ptr(),
+            dst_c.as_ptr(),
+            std::ptr::null(),
+            libc::MS_BIND | libc::MS_REC,
+            std::ptr::null(),
+        )
+    };
+
+    if ret != 0 {
+        return Err(LeewardError::Mount(format!(
+            "failed to bind mount {} to {}: {}",
+            src.display(),
+            dst.display(),
+            std::io::Error::last_os_error()
+        )));
+    }
+
+    Ok(())
+}
+
+fn mount_remount_ro(path: &std::path::Path) -> Result<()> {
+    let path_c = path_to_cstring(path)?;
+
+    // SAFETY: mount syscall to remount read-only
+    let ret = unsafe {
+        libc::mount(
+            std::ptr::null(),
+            path_c.as_ptr(),
+            std::ptr::null(),
+            libc::MS_BIND | libc::MS_REMOUNT | libc::MS_RDONLY,
+            std::ptr::null(),
+        )
+    };
+
+    if ret != 0 {
+        return Err(LeewardError::Mount(format!(
+            "failed to remount {} read-only: {}",
+            path.display(),
+            std::io::Error::last_os_error()
+        )));
+    }
+
+    Ok(())
+}
+
+fn mount_tmpfs(path: &std::path::Path, size: u64) -> Result<()> {
+    let path_c = path_to_cstring(path)?;
+    let fstype = CString::new("tmpfs")
+        .map_err(|e| LeewardError::Mount(format!("invalid fstype: {e}")))?;
+
+    let size_mb = size / (1024 * 1024);
+    let options = CString::new(format!("size={}M", size_mb))
+        .map_err(|e| LeewardError::Mount(format!("invalid options: {e}")))?;
+
+    // SAFETY: mount syscall with tmpfs
+    let ret = unsafe {
+        libc::mount(
+            fstype.as_ptr(),
+            path_c.as_ptr(),
+            fstype.as_ptr(),
+            0,
+            options.as_ptr() as *const libc::c_void,
+        )
+    };
+
+    if ret != 0 {
+        return Err(LeewardError::Mount(format!(
+            "failed to mount tmpfs at {}: {}",
+            path.display(),
+            std::io::Error::last_os_error()
+        )));
+    }
+
+    Ok(())
+}
+
+fn pivot_root(new_root: &std::path::Path, put_old: &std::path::Path) -> Result<()> {
+    let new_root_c = path_to_cstring(new_root)?;
+    let put_old_c = path_to_cstring(put_old)?;
+
+    // SAFETY: pivot_root syscall
+    let ret = unsafe {
+        libc::syscall(
+            libc::SYS_pivot_root,
+            new_root_c.as_ptr(),
+            put_old_c.as_ptr(),
+        )
+    };
+
+    if ret != 0 {
+        return Err(LeewardError::Mount(format!(
+            "pivot_root failed: {}",
+            std::io::Error::last_os_error()
+        )));
+    }
+
+    Ok(())
+}
+
+fn umount2(path: &std::path::Path, flags: i32) -> Result<()> {
+    let path_c = path_to_cstring(path)?;
+
+    // SAFETY: umount2 syscall
+    let ret = unsafe {
+        libc::umount2(path_c.as_ptr(), flags)
+    };
+
+    if ret != 0 {
+        return Err(LeewardError::Mount(format!(
+            "umount2 failed for {}: {}",
+            path.display(),
+            std::io::Error::last_os_error()
+        )));
+    }
+
+    Ok(())
+}
diff --git a/crates/leeward-core/src/isolation/seccomp.rs b/crates/leeward-core/src/isolation/seccomp.rs
index 353d867..d0ab59b 100644
--- a/crates/leeward-core/src/isolation/seccomp.rs
+++ b/crates/leeward-core/src/isolation/seccomp.rs
@@ -1,7 +1,11 @@
 //! Seccomp-BPF syscall filtering with SECCOMP_USER_NOTIF support
 
 use crate::{LeewardError, Result};
-use std::os::unix::io::{AsRawFd, RawFd};
+use std::os::unix::io::RawFd;
+use std::collections::BTreeMap;
+use seccompiler::{
+    SeccompAction, SeccompFilter, SeccompRule, TargetArch
+};
 
 /// Configuration for seccomp filtering
 #[derive(Debug, Clone)]
@@ -31,25 +35,68 @@ impl SeccompConfig {
     /// seccomp notifications. The supervisor can poll this fd and decide
     /// what to do with blocked syscalls.
     pub fn apply(&self) -> Result<Option<SeccompNotifyFd>> {
-        // TODO: Build and apply BPF filter using seccompiler
-        // For notify mode:
-        // 1. Build filter with SECCOMP_RET_USER_NOTIF for blocked syscalls
-        // 2. Use seccomp(SECCOMP_SET_MODE_FILTER, ...) to apply
-        // 3. Get notification fd from seccomp(SECCOMP_GET_NOTIF_SIZES, ...)
-
         tracing::debug!(
             notify = self.notify_mode,
             syscalls = self.allowed_syscalls.len(),
             "applying seccomp filter"
         );
 
-        if self.notify_mode {
-            // TODO: Return actual notification fd
-            // For now, return None as placeholder
-            Ok(None)
-        } else {
-            Ok(None)
+        // Build the filter
+        let filter = self.build_filter()?;
+
+        // Apply the filter
+        // Note: SECCOMP_USER_NOTIF requires kernel 5.0+ and special handling
+        // For now, we'll use basic filtering with KILL action for denied syscalls
+        // Convert filter to BPF program and apply it
+        let bpf_prog: seccompiler::BpfProgram = filter
+            .try_into()
+            .map_err(|e| LeewardError::Seccomp(format!("failed to compile filter to BPF: {e}")))?;
+
+        seccompiler::apply_filter(&bpf_prog)
+            .map_err(|e| LeewardError::Seccomp(format!("failed to apply seccomp filter: {e}")))?;
+
+        tracing::info!("seccomp filter applied with {} allowed syscalls", self.allowed_syscalls.len());
+
+        // SECCOMP_USER_NOTIF would require:
+        // 1. Using raw seccomp() syscall with SECCOMP_FILTER_FLAG_NEW_LISTENER
+        // 2. Getting notification fd from kernel
+        // 3. Setting up notification handler thread
+        // For now, return None as we're using basic filtering
+        Ok(None)
+    }
+
+    /// Build the seccomp filter
+    fn build_filter(&self) -> Result<SeccompFilter> {
+        let mut rules = BTreeMap::new();
+
+        // For each allowed syscall, create a rule with Allow action
+        // SeccompRule::new only takes conditions, the action is Allow by default for matched rules
+        for &syscall_num in &self.allowed_syscalls {
+            rules.insert(
+                syscall_num,
+                vec![SeccompRule::new(vec![])
+                    .map_err(|e| LeewardError::Seccomp(format!("failed to create rule: {e}")))?],
+            );
         }
+
+        // Default action for unmatched syscalls
+        let default_action = if self.log_denials {
+            SeccompAction::Log // Log and deny
+        } else {
+            SeccompAction::KillThread // Kill the thread
+        };
+
+        // Get current architecture
+        let arch = get_arch();
+
+        // Create the filter
+        SeccompFilter::new(
+            rules,
+            default_action,
+            SeccompAction::Allow, // Bad architecture action
+            arch,
+        )
+        .map_err(|e| LeewardError::Seccomp(format!("failed to create seccomp filter: {e}")))
     }
 }
 
@@ -154,6 +201,18 @@ impl Drop for SeccompNotifyFd {
     }
 }
 
+/// Get the current architecture for seccomp
+fn get_arch() -> TargetArch {
+    #[cfg(target_arch = "x86_64")]
+    return TargetArch::x86_64;
+
+    #[cfg(target_arch = "aarch64")]
+    return TargetArch::aarch64;
+
+    #[cfg(not(any(target_arch = "x86_64", target_arch = "aarch64")))]
+    compile_error!("Unsupported architecture for seccomp");
+}
+
 /// Default syscalls needed for Python to run
 fn default_python_syscalls() -> Vec<i64> {
     vec![
diff --git a/crates/leeward-core/src/lib.rs b/crates/leeward-core/src/lib.rs
index e5018b0..0ec0543 100644
--- a/crates/leeward-core/src/lib.rs
+++ b/crates/leeward-core/src/lib.rs
@@ -6,7 +6,6 @@
 //! - Linux namespaces via clone3 (user, pid, mount, net, ipc)
 //! - seccomp user notifications (SECCOMP_USER_NOTIF)
 //! - Landlock filesystem restrictions
-//! - cgroups v2 resource limits (CLONE_INTO_CGROUP)
 //! - Shared memory for zero-copy results (memfd + mmap)
 //! - Pipe-based code delivery to pre-forked workers
 
@@ -17,6 +16,7 @@ pub mod config;
 pub mod error;
 pub mod isolation;
 pub mod pipe;
+pub mod protocol;
 pub mod result;
 pub mod shm;
 pub mod worker;
diff --git a/crates/leeward-daemon/src/protocol.rs b/crates/leeward-core/src/protocol.rs
similarity index 97%
rename from crates/leeward-daemon/src/protocol.rs
rename to crates/leeward-core/src/protocol.rs
index 3ca1bab..08e5c5a 100644
--- a/crates/leeward-daemon/src/protocol.rs
+++ b/crates/leeward-core/src/protocol.rs
@@ -2,9 +2,8 @@
 //!
 //! Supports both traditional msgpack and zero-copy shared memory modes
 
-use leeward_core::ExecutionResult;
+use crate::ExecutionResult;
 use serde::{Deserialize, Serialize};
-use std::os::unix::io::RawFd;
 use std::time::Duration;
 
 /// Request to execute code
diff --git a/crates/leeward-core/src/worker.rs b/crates/leeward-core/src/worker.rs
index c2d6ca3..58504b2 100644
--- a/crates/leeward-core/src/worker.rs
+++ b/crates/leeward-core/src/worker.rs
@@ -1,9 +1,5 @@
-//! Sandbox worker process management
-
 use crate::{pipe::ParentPipe, ExecutionResult, LeewardError, Result, SandboxConfig};
-use std::os::unix::io::RawFd;
 
-/// State of a worker in the pool
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 pub enum WorkerState {
     /// Ready to accept work
@@ -16,33 +12,17 @@ pub enum WorkerState {
     Dead,
 }
 
-/// A pre-forked sandboxed worker process
-///
-/// In the new paradigm:
-/// - Workers are created at daemon startup with clone3 + CLONE_INTO_CGROUP
-/// - Python interpreter is already loaded and idle
-/// - Code is sent via pipe, execution is immediate (~0.5ms)
-/// - Workers survive denied syscalls (SECCOMP_USER_NOTIF)
 #[derive(Debug)]
 pub struct Worker {
-    /// Unique worker ID
     pub id: u32,
-    /// Current state
     pub state: WorkerState,
-    /// Process ID (if running)
     pub pid: Option<i32>,
-    /// Number of executions completed
     pub execution_count: u64,
-    /// Configuration for this worker
     config: SandboxConfig,
-    /// Communication pipe with the worker
     pipe: Option<ParentPipe>,
-    /// Cgroup file descriptor (for CLONE_INTO_CGROUP)
-    cgroup_fd: Option<RawFd>,
 }
 
 impl Worker {
-    /// Create a new worker with the given config
     pub fn new(id: u32, config: SandboxConfig) -> Self {
         Self {
             id,
@@ -51,44 +31,29 @@ impl Worker {
             execution_count: 0,
             config,
             pipe: None,
-            cgroup_fd: None,
         }
     }
 
-    /// Spawn the worker process using pre-fork model
-    ///
-    /// This uses clone3 with CLONE_INTO_CGROUP to create a fully isolated
-    /// worker process with Python already loaded.
     pub fn spawn(&mut self) -> Result<()> {
         use crate::isolation::clone3;
         use crate::pipe::WorkerPipe;
 
         tracing::info!(worker_id = self.id, "spawning pre-forked worker");
 
-        // Create communication pipes
+        // Create pipes for communication
         let worker_pipe = WorkerPipe::new()?;
         let (parent_pipe, child_pipe) = worker_pipe.split();
 
-        // TODO: Create cgroup for this worker and get fd
-        // For now, use -1 as placeholder (will be implemented with cgroups)
-        let cgroup_fd = -1;
-
-        // Get namespace flags from config
-        let namespace_flags = self.config_to_namespace_flags();
-
-        // Clone config for child process
+        // Get namespace flags (but don't include them in clone3, we'll set them inside)
+        let namespace_flags = 0; // We'll enter namespaces from inside the worker
         let config = self.config.clone();
 
-        // Clone the worker process with full isolation
-        let pid = clone3::clone_worker(cgroup_fd, namespace_flags, move || {
-            // Child process: Set up isolation and load Python
+        let pid = clone3::clone_worker(namespace_flags, move || {
             worker_main(child_pipe, &config)
         })?;
 
-        // Parent process: Store worker info
         self.pid = Some(pid);
         self.pipe = Some(parent_pipe);
-        self.cgroup_fd = Some(cgroup_fd);
         self.state = WorkerState::Idle;
 
         tracing::info!(
@@ -100,7 +65,6 @@ impl Worker {
         Ok(())
     }
 
-    /// Execute code in this worker via pipe
     pub fn execute(&mut self, code: &str) -> Result<ExecutionResult> {
         if self.state != WorkerState::Idle {
             return Err(LeewardError::Execution(format!(
@@ -117,14 +81,12 @@ impl Worker {
         self.state = WorkerState::Busy;
         tracing::debug!(worker_id = self.id, code_len = code.len(), "sending code to worker");
 
-        // Send code via pipe
         pipe.send_code(code.as_bytes())?;
+        let result_bytes = pipe.recv_result()?;
 
-        // Receive result via pipe
-        let _result_bytes = pipe.recv_result()?;
-
-        // TODO: Deserialize result from MessagePack
-        let result = ExecutionResult::default();
+        // MessagePack deserialization
+        let result: ExecutionResult = rmp_serde::from_slice(&result_bytes)
+            .map_err(|e| LeewardError::Execution(format!("failed to deserialize result: {}", e)))?;
 
         self.execution_count += 1;
         self.state = WorkerState::Idle;
@@ -138,36 +100,28 @@ impl Worker {
         Ok(result)
     }
 
-    /// Kill and recycle this worker
     pub fn recycle(&mut self) -> Result<()> {
         tracing::info!(worker_id = self.id, "recycling worker");
         self.state = WorkerState::Recycling;
 
-        // Kill existing process if any
         if let Some(pid) = self.pid {
             unsafe {
                 libc::kill(pid, libc::SIGKILL);
             }
         }
 
-        // Close pipe
         self.pipe = None;
-
-        // Reset state
         self.pid = None;
         self.execution_count = 0;
 
-        // Spawn new worker
         self.spawn()
     }
 
-    /// Check if worker should be recycled based on execution count
     #[must_use]
     pub fn should_recycle(&self, max_executions: u64) -> bool {
         self.execution_count >= max_executions
     }
 
-    /// Convert config to namespace flags
     fn config_to_namespace_flags(&self) -> u64 {
         use nix::sched::CloneFlags;
 
@@ -185,26 +139,63 @@ impl Worker {
     }
 }
 
-/// Worker main function (runs in child process)
-fn worker_main(mut pipe: crate::pipe::ChildPipe, _config: &SandboxConfig) -> Result<()> {
-    use crate::isolation::{LandlockConfig, SeccompConfig};
+fn worker_main(mut pipe: crate::pipe::ChildPipe, config: &SandboxConfig) -> Result<()> {
+    use crate::isolation::{LandlockConfig, SeccompConfig, NamespaceConfig};
 
-    tracing::debug!("worker process starting, setting up isolation");
+    tracing::debug!("worker process starting isolation setup");
 
-    // Set up Landlock filesystem restrictions
-    LandlockConfig::default().apply()?;
+    // Step 1: Setup namespaces (critical for security)
+    let namespace_config = NamespaceConfig {
+        user: false,  // User namespace needs UID mapping setup
+        pid: true,    // Isolate process tree
+        mount: true,  // Isolate filesystem
+        net: !config.allow_network,  // Network isolation
+        ipc: true,    // IPC isolation
+        uts: true,    // Hostname isolation
+    };
 
-    // Set up seccomp with NOTIFY mode
-    let _notify_fd = SeccompConfig::default().apply()?;
+    namespace_config.enter()?;
+    tracing::info!("namespaces configured");
 
-    // TODO: Load Python interpreter
-    tracing::info!("worker isolation complete, loading Python");
+    // Step 2: Apply Landlock filesystem restrictions (if available)
+    // Landlock requires Linux 5.13+, but that's okay - we try it
+    let mut landlock = LandlockConfig::default();
 
-    // Enter idle loop, waiting for code via pipe
-    loop {
-        tracing::debug!("worker waiting for code");
+    // Add Python path and libraries as executable
+    if let Some(python_dir) = config.python_path.parent() {
+        landlock = landlock.exec(python_dir).ro(python_dir);
+    }
 
-        // Receive code from daemon
+    // Add read-only paths
+    for path in &config.ro_binds {
+        landlock = landlock.ro(path);
+    }
+
+    // Add read-write paths
+    for path in &config.rw_binds {
+        landlock = landlock.rw(path);
+    }
+
+    // Add /tmp as read-write
+    landlock = landlock.rw("/tmp");
+
+    match landlock.apply() {
+        Ok(_) => tracing::info!("landlock restrictions applied"),
+        Err(e) => {
+            // Landlock is nice to have but not critical if we have seccomp + namespaces
+            tracing::warn!("landlock not available (kernel < 5.13?): {}", e);
+        }
+    }
+
+    // Step 3: Apply seccomp filter (critical for security)
+    let seccomp = SeccompConfig::default();
+    seccomp.apply()?;
+    tracing::info!("seccomp filter applied");
+
+    tracing::info!("worker fully isolated, entering main loop");
+
+    // Main worker loop
+    loop {
         let code = match pipe.recv_code() {
             Ok(code) => code,
             Err(e) => {
@@ -213,20 +204,65 @@ fn worker_main(mut pipe: crate::pipe::ChildPipe, _config: &SandboxConfig) -> Res
             }
         };
 
-        tracing::debug!(code_len = code.len(), "received code, executing");
+        let exec_result = execute_python(&code, config);
 
-        // TODO: Execute code in Python
-        // For now, just echo back
-        let result = code;
+        let result_bytes = match rmp_serde::to_vec(&exec_result) {
+            Ok(bytes) => bytes,
+            Err(e) => {
+                tracing::error!("failed to serialize result: {}", e);
+                break;
+            }
+        };
 
-        // Send result back to daemon
-        if let Err(e) = pipe.send_result(&result) {
+        if let Err(e) = pipe.send_result(&result_bytes) {
             tracing::error!("failed to send result: {}", e);
             break;
         }
-
-        tracing::debug!("result sent, waiting for next code");
     }
 
     Ok(())
 }
+
+fn execute_python(code: &[u8], config: &SandboxConfig) -> ExecutionResult {
+    use std::process::{Command, Stdio};
+    use std::time::Instant;
+
+    let code_str = String::from_utf8_lossy(code);
+    let start = Instant::now();
+
+    let output = match Command::new(&config.python_path)
+        .arg("-c")
+        .arg(code_str.as_ref())
+        .stdin(Stdio::null())
+        .stdout(Stdio::piped())
+        .stderr(Stdio::piped())
+        .output()
+    {
+        Ok(output) => output,
+        Err(e) => {
+            return ExecutionResult {
+                exit_code: -1,
+                stdout: Vec::new(),
+                stderr: format!("Failed to execute Python: {}", e).into_bytes(),
+                duration: start.elapsed(),
+                memory_peak: 0,
+                cpu_time_us: 0,
+                timed_out: false,
+                oom_killed: false,
+            };
+        }
+    };
+
+    let duration = start.elapsed();
+
+    ExecutionResult {
+        exit_code: output.status.code().unwrap_or(-1),
+        stdout: output.stdout,
+        stderr: output.stderr,
+        duration,
+        memory_peak: 0,  // TODO: Get from cgroup memory.peak
+        cpu_time_us: 0,  // TODO: Get from /proc/[pid]/stat
+        timed_out: false, // TODO: Implement timeout handling
+        oom_killed: false, // TODO: Detect from cgroup events
+    }
+}
diff --git a/crates/leeward-daemon/src/main.rs b/crates/leeward-daemon/src/main.rs
index cd17914..d1a6964 100644
--- a/crates/leeward-daemon/src/main.rs
+++ b/crates/leeward-daemon/src/main.rs
@@ -13,7 +13,6 @@ use tracing_subscriber::EnvFilter;
 mod config;
 mod iouring;
 mod pool;
-mod protocol;
 mod server;
 
 use config::DaemonConfig;
@@ -43,6 +42,29 @@ async fn main() -> Result<()> {
     // Remove existing socket
     let _ = std::fs::remove_file(&config.socket_path);
 
+    // Validate Python
+    let python_path = &config.sandbox_config.python_path;
+
+    match std::process::Command::new(python_path)
+        .arg("--version")
+        .output()
+    {
+        Ok(output) => {
+            let version = String::from_utf8_lossy(&output.stdout)
+                .trim()
+                .to_string();
+            let version = if version.is_empty() {
+                String::from_utf8_lossy(&output.stderr).trim().to_string()
+            } else {
+                version
+            };
+            tracing::info!(python = ?python_path, version = %version, "Python ready");
+        }
+        Err(e) => {
+            anyhow::bail!("Python not found or not executable: {}", e);
+        }
+    }
+
     // Bind socket
     let listener = UnixListener::bind(&config.socket_path)?;
     tracing::info!(socket = ?config.socket_path, "listening");
diff --git a/crates/leeward-daemon/src/server.rs b/crates/leeward-daemon/src/server.rs
index f21afd3..6e10506 100644
--- a/crates/leeward-daemon/src/server.rs
+++ b/crates/leeward-daemon/src/server.rs
@@ -1,6 +1,7 @@
 //! Unix socket server
 
-use crate::{config::DaemonConfig, pool::WorkerPool, protocol::{self, Request, Response}};
+use crate::{config::DaemonConfig, pool::WorkerPool};
+use leeward_core::protocol::{self, Request, Response};
 use std::sync::Arc;
 use tokio::{
     io::{AsyncReadExt, AsyncWriteExt},
diff --git a/flake.lock b/flake.lock
index 88df767..c9ff4de 100644
--- a/flake.lock
+++ b/flake.lock
@@ -1,114 +1,5 @@
 {
   "nodes": {
-    "cachix": {
-      "inputs": {
-        "devenv": [
-          "devenv"
-        ],
-        "flake-compat": [
-          "devenv",
-          "flake-compat"
-        ],
-        "git-hooks": [
-          "devenv",
-          "git-hooks"
-        ],
-        "nixpkgs": [
-          "devenv",
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1760971495,
-        "narHash": "sha256-IwnNtbNVrlZIHh7h4Wz6VP0Furxg9Hh0ycighvL5cZc=",
-        "owner": "cachix",
-        "repo": "cachix",
-        "rev": "c5bfd933d1033672f51a863c47303fc0e093c2d2",
-        "type": "github"
-      },
-      "original": {
-        "owner": "cachix",
-        "ref": "latest",
-        "repo": "cachix",
-        "type": "github"
-      }
-    },
-    "devenv": {
-      "inputs": {
-        "cachix": "cachix",
-        "flake-compat": "flake-compat",
-        "flake-parts": "flake-parts",
-        "git-hooks": "git-hooks",
-        "nix": "nix",
-        "nixd": "nixd",
-        "nixpkgs": "nixpkgs"
-      },
-      "locked": {
-        "lastModified": 1767288951,
-        "narHash": "sha256-160ZiJhibIkePTQ3wLjLcPgxseP78sF59psTTm5oLCQ=",
-        "owner": "cachix",
-        "repo": "devenv",
-        "rev": "7f7e03392c9ce626a9ef412d42b3bef2f7f8625e",
-        "type": "github"
-      },
-      "original": {
-        "owner": "cachix",
-        "repo": "devenv",
-        "type": "github"
-      }
-    },
-    "flake-compat": {
-      "flake": false,
-      "locked": {
-        "lastModified": 1761588595,
-        "narHash": "sha256-XKUZz9zewJNUj46b4AJdiRZJAvSZ0Dqj2BNfXvFlJC4=",
-        "owner": "edolstra",
-        "repo": "flake-compat",
-        "rev": "f387cd2afec9419c8ee37694406ca490c3f34ee5",
-        "type": "github"
-      },
-      "original": {
-        "owner": "edolstra",
-        "repo": "flake-compat",
-        "type": "github"
-      }
-    },
-    "flake-parts": {
-      "inputs": {
-        "nixpkgs-lib": [
-          "devenv",
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1760948891,
-        "narHash": "sha256-TmWcdiUUaWk8J4lpjzu4gCGxWY6/Ok7mOK4fIFfBuU4=",
-        "owner": "hercules-ci",
-        "repo": "flake-parts",
-        "rev": "864599284fc7c0ba6357ed89ed5e2cd5040f0c04",
-        "type": "github"
-      },
-      "original": {
-        "owner": "hercules-ci",
-        "repo": "flake-parts",
-        "type": "github"
-      }
-    },
-    "flake-root": {
-      "locked": {
-        "lastModified": 1723604017,
-        "narHash": "sha256-rBtQ8gg+Dn4Sx/s+pvjdq3CB2wQNzx9XGFq/JVGCB6k=",
-        "owner": "srid",
-        "repo": "flake-root",
-        "rev": "b759a56851e10cb13f6b8e5698af7b59c44be26e",
-        "type": "github"
-      },
-      "original": {
-        "owner": "srid",
-        "repo": "flake-root",
-        "type": "github"
-      }
-    },
     "flake-utils": {
       "inputs": {
         "systems": "systems"
@@ -127,144 +18,13 @@
         "type": "github"
       }
     },
-    "git-hooks": {
-      "inputs": {
-        "flake-compat": [
-          "devenv",
-          "flake-compat"
-        ],
-        "gitignore": "gitignore",
-        "nixpkgs": [
-          "devenv",
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1760663237,
-        "narHash": "sha256-BflA6U4AM1bzuRMR8QqzPXqh8sWVCNDzOdsxXEguJIc=",
-        "owner": "cachix",
-        "repo": "git-hooks.nix",
-        "rev": "ca5b894d3e3e151ffc1db040b6ce4dcc75d31c37",
-        "type": "github"
-      },
-      "original": {
-        "owner": "cachix",
-        "repo": "git-hooks.nix",
-        "type": "github"
-      }
-    },
-    "gitignore": {
-      "inputs": {
-        "nixpkgs": [
-          "devenv",
-          "git-hooks",
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1709087332,
-        "narHash": "sha256-HG2cCnktfHsKV0s4XW83gU3F57gaTljL9KNSuG6bnQs=",
-        "owner": "hercules-ci",
-        "repo": "gitignore.nix",
-        "rev": "637db329424fd7e46cf4185293b9cc8c88c95394",
-        "type": "github"
-      },
-      "original": {
-        "owner": "hercules-ci",
-        "repo": "gitignore.nix",
-        "type": "github"
-      }
-    },
-    "nix": {
-      "inputs": {
-        "flake-compat": [
-          "devenv",
-          "flake-compat"
-        ],
-        "flake-parts": [
-          "devenv",
-          "flake-parts"
-        ],
-        "git-hooks-nix": [
-          "devenv",
-          "git-hooks"
-        ],
-        "nixpkgs": [
-          "devenv",
-          "nixpkgs"
-        ],
-        "nixpkgs-23-11": [
-          "devenv"
-        ],
-        "nixpkgs-regression": [
-          "devenv"
-        ]
-      },
-      "locked": {
-        "lastModified": 1766922625,
-        "narHash": "sha256-O0wExzdYqSNqbPYCQhUWeoKlDa7q6wxhuWiHolxqdl8=",
-        "owner": "cachix",
-        "repo": "nix",
-        "rev": "c62c4bdb6673871ae5cdc51c498df6292d5169aa",
-        "type": "github"
-      },
-      "original": {
-        "owner": "cachix",
-        "ref": "devenv-2.32",
-        "repo": "nix",
-        "type": "github"
-      }
-    },
-    "nixd": {
-      "inputs": {
-        "flake-parts": [
-          "devenv",
-          "flake-parts"
-        ],
-        "flake-root": "flake-root",
-        "nixpkgs": [
-          "devenv",
-          "nixpkgs"
-        ],
-        "treefmt-nix": "treefmt-nix"
-      },
-      "locked": {
-        "lastModified": 1763964548,
-        "narHash": "sha256-JTRoaEWvPsVIMFJWeS4G2isPo15wqXY/otsiHPN0zww=",
-        "owner": "nix-community",
-        "repo": "nixd",
-        "rev": "d4bf15e56540422e2acc7bc26b20b0a0934e3f5e",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nix-community",
-        "repo": "nixd",
-        "type": "github"
-      }
-    },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1761313199,
-        "narHash": "sha256-wCIACXbNtXAlwvQUo1Ed++loFALPjYUA3dpcUJiXO44=",
-        "owner": "cachix",
-        "repo": "devenv-nixpkgs",
-        "rev": "d1c30452ebecfc55185ae6d1c983c09da0c274ff",
-        "type": "github"
-      },
-      "original": {
-        "owner": "cachix",
-        "ref": "rolling",
-        "repo": "devenv-nixpkgs",
-        "type": "github"
-      }
-    },
-    "nixpkgs_2": {
-      "locked": {
-        "lastModified": 1761114652,
-        "narHash": "sha256-f/QCJM/YhrV/lavyCVz8iU3rlZun6d+dAiC3H+CDle4=",
+        "lastModified": 1767116409,
+        "narHash": "sha256-5vKw92l1GyTnjoLzEagJy5V5mDFck72LiQWZSOnSicw=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "01f116e4df6a15f4ccdffb1bcd41096869fb385c",
+        "rev": "cad22e7d996aea55ecab064e84834289143e44a0",
         "type": "github"
       },
       "original": {
@@ -274,40 +34,25 @@
         "type": "github"
       }
     },
-    "nixpkgs_3": {
-      "locked": {
-        "lastModified": 1744536153,
-        "narHash": "sha256-awS2zRgF4uTwrOKwwiJcByDzDOdo3Q1rPZbiHQg/N38=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "18dd725c29603f582cf1900e0d25f9f1063dbf11",
-        "type": "github"
-      },
-      "original": {
-        "owner": "NixOS",
-        "ref": "nixpkgs-unstable",
-        "repo": "nixpkgs",
-        "type": "github"
-      }
-    },
     "root": {
       "inputs": {
-        "devenv": "devenv",
         "flake-utils": "flake-utils",
-        "nixpkgs": "nixpkgs_2",
+        "nixpkgs": "nixpkgs",
         "rust-overlay": "rust-overlay"
       }
     },
     "rust-overlay": {
       "inputs": {
-        "nixpkgs": "nixpkgs_3"
+        "nixpkgs": [
+          "nixpkgs"
+        ]
       },
       "locked": {
-        "lastModified": 1766890375,
-        "narHash": "sha256-0Zi7ChAtjq/efwQYmp7kOJPcSt6ya9ynSUe6ppgZhsQ=",
+        "lastModified": 1767322002,
+        "narHash": "sha256-yHKXXw2OWfIFsyTjduB4EyFwR0SYYF0hK8xI9z4NIn0=",
         "owner": "oxalica",
         "repo": "rust-overlay",
-        "rev": "91e1f7a0017065360f447622d11b7ce6ed04772f",
+        "rev": "03c6e38661c02a27ca006a284813afdc461e9f7e",
         "type": "github"
       },
       "original": {
@@ -330,28 +75,6 @@
         "repo": "default",
         "type": "github"
       }
-    },
-    "treefmt-nix": {
-      "inputs": {
-        "nixpkgs": [
-          "devenv",
-          "nixd",
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1734704479,
-        "narHash": "sha256-MMi74+WckoyEWBRcg/oaGRvXC9BVVxDZNRMpL+72wBI=",
-        "owner": "numtide",
-        "repo": "treefmt-nix",
-        "rev": "65712f5af67234dad91a5a4baee986a8b62dbf8f",
-        "type": "github"
-      },
-      "original": {
-        "owner": "numtide",
-        "repo": "treefmt-nix",
-        "type": "github"
-      }
     }
   },
   "root": "root",
diff --git a/flake.nix b/flake.nix
index 6f62a17..31b3cff 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,36 +1,235 @@
 {
-  description = "Run untrusted Python code safely with native Linux isolation";
+  description = "Linux-native sandbox for running untrusted code";
 
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    rust-overlay = {
+      url = "github:oxalica/rust-overlay";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
     flake-utils.url = "github:numtide/flake-utils";
-    rust-overlay.url = "github:oxalica/rust-overlay";
-    devenv.url = "github:cachix/devenv";
   };
 
-  outputs = inputs@{ self, nixpkgs, flake-utils, rust-overlay, devenv }:
+  outputs = { self, nixpkgs, rust-overlay, flake-utils }:
     let
-      nixosModules.default = import ./nix/module.nix;
-    in
-    flake-utils.lib.eachDefaultSystem (system:
-      let
-        overlays = [ (import rust-overlay) ];
-        pkgs = import nixpkgs { inherit system overlays; };
-        lib = import ./nix/lib.nix { inherit pkgs; };
-        packages = import ./nix/packages.nix { inherit pkgs lib; };
-      in
-      {
-        packages = {
-          default = packages.leeward-all;
-          cli = packages.leeward-cli;
-          daemon = packages.leeward-daemon;
-          ffi = packages.leeward-ffi;
+      supportedSystems = [ "x86_64-linux" "aarch64-linux" ];
+
+      forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
+
+      nixpkgsFor = forAllSystems (system: import nixpkgs {
+        inherit system;
+        overlays = [ rust-overlay.overlays.default ];
+      });
+
+      # Read version from Cargo.toml
+      cargoToml = builtins.fromTOML (builtins.readFile ./Cargo.toml);
+      version = cargoToml.workspace.package.version;
+
+      buildLeeward = { pkgs, target ? null, static ? false }:
+        let
+          rustToolchain = if static then
+            pkgs.rust-bin.stable.latest.default.override {
+              targets = [ "x86_64-unknown-linux-musl" ];
+            }
+          else
+            pkgs.rust-bin.stable.latest.default;
+
+          buildInputs = with pkgs; [
+            python3
+          ] ++ lib.optionals static [
+            pkgs.pkgsStatic.stdenv.cc
+          ];
+
+          nativeBuildInputs = with pkgs; [
+            rustToolchain
+            pkg-config
+          ];
+
+        in pkgs.rustPlatform.buildRustPackage {
+          pname = "leeward";
+          inherit version;
+
+          src = pkgs.lib.cleanSource ./.;
+
+          cargoLock.lockFile = ./Cargo.lock;
+
+          inherit buildInputs nativeBuildInputs;
+
+          CARGO_BUILD_TARGET = if static then "x86_64-unknown-linux-musl" else null;
+          CARGO_BUILD_RUSTFLAGS = if static then "-C target-feature=+crt-static" else "";
+
+          postInstall = ''
+            mkdir -p $out/bin
+
+            if [ -f target/*/release/leeward-daemon ]; then
+              mv target/*/release/leeward-daemon $out/bin/
+              mv target/*/release/leeward $out/bin/
+            else
+              mv target/release/leeward-daemon $out/bin/ || true
+              mv target/release/leeward $out/bin/ || true
+            fi
+
+            ${if static then "${pkgs.binutils}/bin/strip $out/bin/*" else ""}
+
+            mkdir -p $out/lib/systemd/{system,user}
+            cp contrib/leeward.system.service $out/lib/systemd/system/leeward.service
+            cp contrib/leeward.user.service $out/lib/systemd/user/leeward.service
+          '';
+
+          meta = with pkgs.lib; {
+            description = "Linux-native sandbox for running untrusted code";
+            homepage = "https://github.com/vektia/leeward";
+            license = licenses.asl20;
+            platforms = [ "x86_64-linux" "aarch64-linux" ];
+            mainProgram = "leeward";
+          };
         };
 
-        devShells.default = devenv.lib.mkShell {
-          inherit inputs pkgs;
-          modules = [ (import ./nix/shell.nix) ];
+      buildDeb = { pkgs, leeward }:
+        let
+          arch = if pkgs.stdenv.hostPlatform.system == "x86_64-linux" then "amd64"
+                 else if pkgs.stdenv.hostPlatform.system == "aarch64-linux" then "arm64"
+                 else throw "Unsupported architecture";
+        in pkgs.stdenv.mkDerivation {
+          pname = "leeward-deb";
+          inherit version;
+
+          dontUnpack = true;
+          dontBuild = true;
+
+          nativeBuildInputs = [ pkgs.dpkg ];
+
+          installPhase = ''
+            mkdir -p $out
+            mkdir -p deb/DEBIAN deb/usr/bin deb/usr/lib/systemd/{system,user}
+
+            cp ${leeward}/bin/* deb/usr/bin/
+            cp ${leeward}/lib/systemd/system/*.service deb/usr/lib/systemd/system/
+            cp ${leeward}/lib/systemd/user/*.service deb/usr/lib/systemd/user/
+            cat > deb/DEBIAN/control <<EOF
+            Package: leeward
+            Version: ${version}
+            Architecture: ${arch}
+            Maintainer: Vektia <hello@vektia.com.br>
+            Description: Linux-native sandbox for running untrusted code
+            Homepage: https://github.com/vektia/leeward
+            Section: devel
+            Priority: optional
+            Depends: python3
+            EOF
+
+            cat > deb/DEBIAN/postinst <<'EOF'
+            #!/bin/sh
+            set -e
+            if ! getent passwd leeward >/dev/null; then
+                useradd -r -s /usr/sbin/nologin -d /nonexistent leeward
+            fi
+            mkdir -p /run/leeward
+            chown leeward:leeward /run/leeward
+            if [ -d /run/systemd/system ]; then
+                systemctl daemon-reload
+            fi
+            EOF
+            chmod 755 deb/DEBIAN/postinst
+
+            dpkg-deb --build deb $out/leeward_${version}_${arch}.deb
+          '';
+        };
+
+    in {
+      packages = forAllSystems (system:
+        let
+          pkgs = nixpkgsFor.${system};
+          leeward = buildLeeward { inherit pkgs; };
+
+        in {
+          default = leeward;
+          leeward-static = if system == "x86_64-linux"
+            then buildLeeward { inherit pkgs; static = true; }
+            else null;
+          leeward-deb = buildDeb { inherit pkgs leeward; };
+        } // pkgs.lib.optionalAttrs (system == "x86_64-linux") {
+          leeward-x86_64 = leeward;
+        } // pkgs.lib.optionalAttrs (system == "aarch64-linux") {
+          leeward-aarch64 = leeward;
+        });
+
+      devShells = forAllSystems (system:
+        let
+          pkgs = nixpkgsFor.${system};
+          rustToolchain = pkgs.rust-bin.stable.latest.default.override {
+            extensions = [ "rust-src" "rust-analyzer" ];
+          };
+        in {
+          default = pkgs.mkShell {
+            buildInputs = with pkgs; [
+              rustToolchain
+              cargo-watch
+              cargo-audit
+              pkg-config
+              python3
+              mold
+              clang
+            ];
+
+            RUST_SRC_PATH = "${rustToolchain}/lib/rustlib/src/rust/library";
+            LEEWARD_SOCKET = "$PWD/.leeward.sock";
+
+            shellHook = "";
+          };
+        });
+
+      nixosModules.default = { config, lib, pkgs, ... }:
+        with lib;
+        let
+          cfg = config.services.leeward;
+        in {
+          options.services.leeward = {
+            enable = mkEnableOption "Leeward sandbox daemon";
+
+            workers = mkOption {
+              type = types.int;
+              default = 4;
+              description = "Number of pre-forked workers";
+            };
+
+            package = mkOption {
+              type = types.package;
+              default = self.packages.${pkgs.system}.default;
+              description = "Leeward package to use";
+            };
+          };
+
+          config = mkIf cfg.enable {
+            systemd.services.leeward = {
+              description = "Leeward Sandbox Daemon";
+              wantedBy = [ "multi-user.target" ];
+              after = [ "network.target" ];
+
+              serviceConfig = {
+                Type = "simple";
+                ExecStart = "${cfg.package}/bin/leeward-daemon --workers ${toString cfg.workers}";
+                Restart = "always";
+                RestartSec = 5;
+                User = "leeward";
+                Group = "leeward";
+                NoNewPrivileges = true;
+                ProtectSystem = "strict";
+                ProtectHome = true;
+                PrivateTmp = true;
+                RuntimeDirectory = "leeward";
+                RuntimeDirectoryMode = "0755";
+              };
+            };
+
+            users.users.leeward = {
+              isSystemUser = true;
+              group = "leeward";
+              description = "Leeward daemon user";
+            };
+
+            users.groups.leeward = {};
+          };
         };
-      }
-    ) // { inherit nixosModules; };
+    };
 }
\ No newline at end of file
diff --git a/nix/lib.nix b/nix/lib.nix
deleted file mode 100644
index 398fd95..0000000
--- a/nix/lib.nix
+++ /dev/null
@@ -1,14 +0,0 @@
-{ pkgs }:
-
-{
-  cargoVersion = path:
-    let
-      cargoToml = builtins.fromTOML (builtins.readFile path);
-    in
-    cargoToml.workspace.package.version or cargoToml.package.version;
-
-  buildDeps = with pkgs; [
-    pkg-config
-    libseccomp
-  ];
-}
\ No newline at end of file
diff --git a/nix/module.nix b/nix/module.nix
deleted file mode 100644
index 1df18fc..0000000
--- a/nix/module.nix
+++ /dev/null
@@ -1,71 +0,0 @@
-{ config, lib, pkgs, ... }:
-
-with lib;
-
-let
-  cfg = config.services.leeward;
-
-  leeward = pkgs.callPackage ./packages.nix { inherit pkgs; };
-in {
-  options.services.leeward = {
-    enable = mkEnableOption "leeward sandbox daemon";
-
-    package = mkOption {
-      type = types.package;
-      default = leeward.leeward-daemon;
-      description = "The leeward package to use.";
-    };
-
-    numWorkers = mkOption {
-      type = types.int;
-      default = 4;
-      description = "Number of worker processes in the pool.";
-    };
-
-    recycleAfter = mkOption {
-      type = types.int;
-      default = 100;
-      description = "Recycle workers after this many executions.";
-    };
-  };
-
-  config = mkIf cfg.enable {
-    systemd.services.leeward = {
-      description = "Leeward sandbox daemon";
-      documentation = [ "https://github.com/vektia/leeward" ];
-      after = [ "network.target" ];
-      wantedBy = [ "multi-user.target" ];
-
-      serviceConfig = {
-        Type = "simple";
-        ExecStart = "${cfg.package}/bin/leeward-daemon";
-        Restart = "on-failure";
-        RestartSec = "5s";
-
-        # Security hardening
-        NoNewPrivileges = true;
-        PrivateTmp = true;
-        ProtectSystem = "strict";
-        ProtectHome = true;
-        ReadWritePaths = [ "/run/leeward" ];
-
-        # Runtime directory
-        RuntimeDirectory = "leeward";
-        RuntimeDirectoryMode = "0755";
-
-        # Logging
-        StandardOutput = "journal";
-        StandardError = "journal";
-        SyslogIdentifier = "leeward-daemon";
-      };
-    };
-
-    # Create group for socket access
-    users.groups.leeward = {};
-
-    # Ensure runtime directory permissions
-    systemd.tmpfiles.rules = [
-      "d /run/leeward 0755 root leeward - -"
-    ];
-  };
-}
diff --git a/nix/packages.nix b/nix/packages.nix
deleted file mode 100644
index faa7c79..0000000
--- a/nix/packages.nix
+++ /dev/null
@@ -1,52 +0,0 @@
-{ pkgs, lib }:
-
-let
-  version = lib.cargoVersion ../Cargo.toml;
-  buildDeps = lib.buildDeps;
-  src = pkgs.lib.cleanSource ../.;
-
-  rustBuild = {
-    inherit version src;
-    cargoLock.lockFile = ../Cargo.lock;
-    nativeBuildInputs = with pkgs; [ clang mold ] ++ buildDeps;
-    buildInputs = buildDeps;
-    RUSTFLAGS = "-C link-arg=-fuse-ld=mold";
-  };
-
-  leeward-cli = pkgs.rustPlatform.buildRustPackage (rustBuild // {
-    pname = "leeward-cli";
-    cargoBuildFlags = [ "-p" "leeward-cli" ];
-    cargoTestFlags = [ "-p" "leeward-cli" ];
-  });
-
-  leeward-daemon = pkgs.rustPlatform.buildRustPackage (rustBuild // {
-    pname = "leeward-daemon";
-    cargoBuildFlags = [ "-p" "leeward-daemon" ];
-    cargoTestFlags = [ "-p" "leeward-daemon" ];
-  });
-
-  leeward-ffi = pkgs.rustPlatform.buildRustPackage (rustBuild // {
-    pname = "leeward-ffi";
-    cargoBuildFlags = [ "-p" "leeward-ffi" ];
-    cargoTestFlags = [ "-p" "leeward-ffi" ];
-    nativeBuildInputs = with pkgs; [ clang mold cbindgen ] ++ buildDeps;
-
-    postInstall = ''
-      mkdir -p $out/lib $out/include
-      cp target/release/libleeward.so $out/lib/ 2>/dev/null || true
-      cp target/release/libleeward.a $out/lib/ 2>/dev/null || true
-      if [ -f include/leeward.h ]; then
-        cp include/leeward.h $out/include/
-      fi
-    '';
-  });
-
-in
-{
-  inherit leeward-cli leeward-daemon leeward-ffi;
-
-  leeward-all = pkgs.symlinkJoin {
-    name = "leeward-${version}";
-    paths = [ leeward-cli leeward-daemon leeward-ffi ];
-  };
-}
\ No newline at end of file
diff --git a/nix/shell.nix b/nix/shell.nix
deleted file mode 100644
index 5254adc..0000000
--- a/nix/shell.nix
+++ /dev/null
@@ -1,19 +0,0 @@
-{ pkgs, config, ... }:
-
-{
-  packages = with pkgs; [
-    cargo-watch
-    pkg-config
-    libseccomp
-    mold
-  ];
-
-  languages.rust.enable = true;
-
-  env = {
-    LIBSECCOMP_LINK_TYPE = "dylib";
-    LIBSECCOMP_LIB_PATH = "${pkgs.libseccomp}/lib";
-    PKG_CONFIG_PATH = "${pkgs.libseccomp}/lib/pkgconfig";
-    LEEWARD_SOCKET = "${config.env.DEVENV_STATE}/leeward.sock";
-  };
-}
\ No newline at end of file