Senior Smart Contract Engineer (Solidity)
Contract or Full-time · 📍 Remote
Write production Solidity for enterprise clients — DeFi lending protocols, RWA tokenization platforms, stablecoin infrastructure, and account abstraction systems. Different client every 2–4 months. $180K–$300K.
What You'll Do
- Design, develop, and deploy production smart contracts (DeFi, tokenization, payments)
- Write comprehensive Foundry/Hardhat test suites with >95% coverage
- Optimize contracts for gas efficiency without sacrificing security
- Conduct internal security reviews before client delivery
- Collaborate directly with client engineering teams (embedded, not siloed)
- Document architecture decisions and interface specifications
What We Look For
- 3+ years shipping Solidity to mainnet (not just testnet)
- Deep knowledge of ERC-20, ERC-721, ERC-1155, ERC-4337 standards
- Foundry or Hardhat proficiency
- Security-first mindset: attack vectors before features
- Experience with at least 2 of: DeFi protocols, token standards, access control patterns, upgradeable contracts (UUPS/Diamond)
- Comfortable working directly with non-technical stakeholders (client-facing)
What Makes This Different
- Variety: 3–5 different protocol architectures per year
- Flexibility: Contract, full-time, or fractional — your call
- No token risk: Stable billing, real revenue
- Speed: ~1 week from first contact to start
How to Apply
Send your GitHub (or relevant work), one sentence about your most interesting project, and engagement preference (contract / full-time / open to either).