Smart Contract Engineer (Solidity, EVM)

About the Role

Saifuro checks payments that AI agents try to make. An agent asks to spend, we compare the request with a mandate a human approved earlier, and the answer comes back signed so the receiving side can verify it. There s escrow on Base and Solana for trades between agents, and settlement is in USDC, onchain. We never hold customer funds. The docs are public at docs.saifuro.com, and the people who use them are developers building agents and the teams selling APIs to those agents. The escrow is the one place where our code holds other people s money. Funds go in, sit until a signed verdict says the deal is done, and come out to the seller or back to the buyer, with no path in which Saifuro can move them. Your job is to own the EVM side: the escrow, the verifier that checks our signatures onchain, the audits and the deployments. Call it Solidity developer, smart contract developer or blockchain developer if you prefer. It s Solidity first. What you d be doing • The escrow. One contract system on Base: funds held until a signed verdict releases them, refunds that work without us, and no path in which Saifuro can move a counterparty s money. Design, code and tests are yours. • The verifier. The contracts check our signature, the audience and the expiry before anything moves. You own that path onchain. The CTO runs the signing side and reviews your code. • Audits and releases. An external audit before every mainnet release. You scope it, answer the findings and ship, with deployment scripts, a pause switch and a recovery runbook alongside. • What comes next, at your pace. Milestone and multi-party escrow next year, and the same contracts on more EVM chains. None of it is a day-one requirement. What we need from you • You ve shipped Solidity to mainnet. • You live in one of the countries we can hire in. Beyond these requirements, we ll support you in learning whatever else the role demands. If your experience is relevant but your title differs, we would still like to hear ...