Senior Web3 & Smart Contract Developer (DeFi / Protocol)
Location: London, UK
Industry: Decentralized Finance (DeFi) & Web3 Protocol Studio
About the Opportunity
We are partnering with a fast-growing, venture-backed Web3 protocol studio expanding its core smart contract engineering team.
The team is building next-generation decentralized finance (DeFi) primitives, automated market maker (AMM) protocols, and cross-chain liquidity infrastructure. They are looking for a Senior Web3 / Smart Contract Developer to architect secure, gas-optimized protocol smart contracts and oversee production main net deployments.
Key Responsibilities
- Smart Contract Architecture: Design, write, test, and deploy secure, gas-optimized smart contracts in Solidity or Rust (EVM / Solana ecosystems).
- Protocol Security: Conduct rigorous unit testing (Foundry / Hardhat), perform formal verification, and work alongside external security auditing firms prior to mainnet launches.
- dApp Connectivity: Collaborate with frontend engineers to integrate smart contract state interactions via Ethers.js, Viem, or Wagmi.
- DeFi Logic Implementation: Implement decentralized financial mechanisms including yield vaults, staking rewards, liquidity pools, and governance (DAO) logic.
Key Requirements
- Languages: 3+ years of production experience writing Solidity or Rust (for Solana programs).
- Web3 Tooling: Deep familiarity with modern smart contract testing frameworks (Foundry, Hardhat).
- DeFi & Security Knowledge: Practical understanding of common DeFi standards (ERC-20, ERC-721, ERC-1155, ERC-4626) and security vectors (reentrancy, flash loans, front-running/MEV).
- Track Record: Verified smart contracts deployed on Ethereum, Arbitrum, Optimism, Base, or Solana mainnets.
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Blockchain Developer employer: Morgan McKinley
As a leading international savings and investments business with over a century of experience, we pride ourselves on fostering a supportive and inclusive work environment that prioritises employee well-being and professional growth. Our flexible working arrangements and commitment to workplace accommodations ensure that you can thrive in your role as the Group Financial Crime Policy and Standards Manager, while contributing to our mission of delivering exceptional financial outcomes for our clients. Join us to be part of a dynamic team that values collaboration, innovation, and integrity in the financial sector.
