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Oladayo-Ahmod/README.md

Oladayo Ahmod · 0xSpectreSec

Full-Stack Blockchain Developer · Smart Contract Security Researcher

Building production systems · Breaking them on purpose · Cyfrin grad

X GitHub Email


About me

Full-stack blockchain developer and smart contract security researcher with 5 years of engineering experience — 4+ years building across the entire Web3 stack since 2022, with a deliberate security-focused shift since 2025.

My background spans EVM and non-EVM ecosystems — Solidity, Cairo, Rust, Leo (Aleo), TypeScript — giving me end-to-end system intuition that single-chain developers lack. I understand how protocols are architected from every layer, which sharpens how I find where they break.

One of the few developers who can read and reason about ZK-native smart contracts on Aleo, FHE-based confidential computation via Fhenix CoFHE, and Account Abstraction (ERC-4337) patterns across multiple ecosystems.


Security work

cyfrin grad       →   Puppy Raffle · ThunderLoan · TSwap audit exercises . Boss Bridge audit
codehawks         →   3 First Flights (ThunderLoan · Snowman Airdrop · Festival Pass)
                      4 valid findings · 3 High · 1 Medium
dvdf v4           →   all 18 challenges solved — flash loans · oracles · governance
                      proxy vulnerabilities · ABI encoding · CREATE2 · L2 bridges
exploit classes   →   flash loan attacks · reentrancy · ERC-2771 spoofing · arbitrary calldata
                      governance/snapshot manipulation · oracle manipulation (spot · TWAP · V3)
                      Safe wallet supply chain exploitation · storage slot collision · ABI smuggling
defi mechanics    →   AMM constant-product · LP mint/burn · swap routing · flash swap callbacks
                      CREATE2 pair addressing · TWAP oracle design · concentrated liquidity (V3)
                      Merkle distributions · L2 bridge mechanics · Curve stableswap
tools             →   Foundry · Slither · Aderyn · Echidna · Hardhat
platforms         →   Sherlock · HackenProof · Immunefi · Codehawks · Guardian

Audit portfolio

Actively competing — updated after every contest

4 valid findings across 3 Codehawks First Flights · 3 High · 1 Medium

# Contest Platform Valid findings Severity Date
1 ThunderLoan (First Flight) Codehawks 2 2 H: deposit() accepted as a substitute for repay(), storage collision on upgrade 2026
2 Snowman Airdrop (First Flight) Codehawks 1 1 H: malformed EIP-712 MESSAGE_TYPEHASH breaks all wallet-signed claims 2026
3 Festival Pass (First Flight) Codehawks 1 1 M: off-by-one in redeemMemorabilia supply cap 2026
4 Alt Fun Guardian — Live contest, in progress 2026

Codehawks reports are private; findings above were matched against the judged answer keys. Public PoCs and write-ups are coming.


Featured security work

Project Description Stack
DVDF v4 Solutions All 18 challenges solved — flash loans · oracles · governance · proxies · ABI smuggling · L2 bridges Solidity · Foundry
audit-puppy-raffle Cyfrin curriculum audit — reentrancy · randomness manipulation Solidity
audit-thunderloan Cyfrin curriculum audit — oracle price manipulation · fee logic Solidity

Featured builds

Project Description Chain Stack
Veilance Privacy-first freelancing platform with ZK milestone escrow · Aleo Leo · Next.js · Supabase
MindCast Decentralized podcast platform — live mainnet deployment (registry, ERC-20, staking) 0G Chain Solidity · Next.js
Sealect FHE-powered confidential decision platform — vendor selection, blind review, KYC gate, private payments Arbitrum Solidity · FHE · Next.js
Neroworks Decentralized freelance marketplace with Account Abstraction and Paymaster for gasless onboarding Nero Chain Solidity · Next.js · AA
Conviction Matrix Real-time institutional signal engine — 9 live API modules, EIP-712 order signing, trade execution EVM TypeScript · ethers v6
dFreelancer Fully on-chain decentralized freelancing platform Ethereum Solidity
DAO dApp Decentralized Autonomous Organisation Ethereum Solidity · Next.js · TS
icp-lottery On-chain lottery ICP Rust

Technical stack

Smart contract languages

Solidity Cairo Rust Leo FHE

Web & backend

TypeScript Next.js Node.js NestJS PHP Laravel

Security tools

Foundry Slither Aderyn Echidna


Multi-chain experience

Ethereum Arbitrum StarkNet zkSync Aleo 0G Chain Nero Chain Celo ICP Sui XRPL


Full-stack skills

Layer Skills
Smart contracts Solidity · Cairo · Rust · Leo (Aleo) · FHE (Fhenix CoFHE) · Account Abstraction (ERC-4337) · Paymaster
Frontend Next.js · React · TypeScript · Ethers.js · Wagmi · Viem · Starknet.js
Backend Node.js · Express · PHP · Laravel · TypeScript SDKs · MCP servers
Databases MySQL · MongoDB · PostgreSQL · Supabase
Infrastructure REST APIs · GraphQL · LAMP · MERN

Currently

  • ✅ Completed Damn Vulnerable DeFi v4 — all 18 challenges solved with full audit reports and PoCs
  • ✅ Placed 4 valid H/M findings across 3 Codehawks First Flights
  • 🏆 Live contest on Guardian (Alt Fun); actively competing on Sherlock · HackenProof · Immunefi · Codehawks
  • 📖 Reading audit reports daily on Solodit.xyz
  • 🔐 Deepening fuzz testing with handler-based invariant testing
  • 📝 Building in public

"The best auditors aren't just bug hunters — they're builders who understand how things break."

Open to: Private audits · ZK security research · Contest collaborations · Full-stack blockchain consulting

Pinned Loading

  1. veilance veilance Public

    TypeScript

  2. dFreelancer dFreelancer Public

    This is a fully on-chain decentralized freelancing platform deployed to sepolia testnet

    CSS

  3. an_nft_marketplace an_nft_marketplace Public

    An NFT marketplace deployed to Celo blockchain

    JavaScript 4

  4. DAO_dApp_Typescript DAO_dApp_Typescript Public

    A decentralized Autonomous Organisation (DAO) dApp with solidity, next js and typescript

    TypeScript

  5. escrow-contract escrow-contract Public

    TypeScript