diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..6033a68
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,75 @@
+name: CI
+
+on:
+  pull_request:
+  push:
+    branches: [main]
+  workflow_dispatch:
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/cache@v4
+        with:
+          path: ~/.cache/biome
+          key: biome-${{ runner.os }}-${{ hashFiles('biome.json') }}
+          restore-keys: biome-${{ runner.os }}-
+      - uses: biomejs/setup-biome@v2
+        with:
+          version: 2.1.2
+      - run: biome ci --linter-enabled=true --formatter-enabled=true
+
+  typecheck:
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: frontend
+    steps:
+      - uses: actions/checkout@v4
+      - uses: pnpm/action-setup@v4
+        with:
+          version: 10
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: pnpm
+          cache-dependency-path: frontend/pnpm-lock.yaml
+      - run: pnpm install --frozen-lockfile
+      - run: pnpm typecheck
+
+  build:
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: frontend
+    steps:
+      - uses: actions/checkout@v4
+      - uses: pnpm/action-setup@v4
+        with:
+          version: 10
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: pnpm
+          cache-dependency-path: frontend/pnpm-lock.yaml
+      - run: pnpm install --frozen-lockfile
+      - run: pnpm build
+
+  rust:
+    runs-on: ubuntu-latest
+    # Match the backend Dockerfile's build image so bindgen sees a libclang
+    # new enough for the upstream C23 (`constexpr`) headers from monad-bft.
+    container: rust:1.91-slim
+    steps:
+      - name: Install build dependencies
+        run: |
+          apt-get update
+          apt-get install -y git curl gcc g++ cmake pkg-config libssl-dev libclang-dev libzstd-dev libhugetlbfs-dev
+      - uses: actions/checkout@v4
+      - run: rustup component add rustfmt clippy
+      - uses: Swatinem/rust-cache@v2
+      - run: cargo fmt --all --check
+      - run: cargo clippy --all-targets --all-features -- -D warnings
+      - run: cargo build --all-targets
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
deleted file mode 100644
index a45e8ad..0000000
--- a/.github/workflows/lint.yml
+++ /dev/null
@@ -1,24 +0,0 @@
-name: Lint
-
-on:
-  pull_request:
-
-jobs:
-  lint:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v4
-      - name: Cache Biome
-        uses: actions/cache@v4
-        with:
-          path: ~/.cache/biome
-          key: biome-${{ runner.os }}-${{ hashFiles('biome.json') }}
-          restore-keys: |
-            biome-${{ runner.os }}-
-      - name: Setup Biome
-        uses: biomejs/setup-biome@v2
-        with:
-          version: 2.1.2
-      - name: Run Biome
-        run: biome ci --linter-enabled=true --formatter-enabled=true
diff --git a/frontend/package.json b/frontend/package.json
index e514025..5367bdc 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -6,7 +6,8 @@
     "dev": "next dev",
     "build": "next build",
     "start": "next start",
-    "lint": "eslint"
+    "lint": "eslint",
+    "typecheck": "tsc --noEmit"
   },
   "dependencies": {
     "@number-flow/react": "0.5.10",