Smart Contract Engineer (Solidity, EVM)

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Smart Contract Engineer (Solidity, EVM) Employment type: Full-time/Company: Saifuro Saifuro checks payments that AI agents try to make: requests are compared to a human-approved mandate and answered with a signed verdict. They provide escrow on Base and Solana with onchain USDC settlement and never hold customer funds. Applicants must live in a country where Saifuro is able to hire. Responsibilities: - Design, implement and test the escrow contract system on Base so funds are held trustlessly and cannot be moved by Saifuro. - Implement the onchain verifier that validates Saifuro signatures, audience and expiry before any action. - Scope and manage external audits, address findings and ship releases with deployment scripts, a pause switch and a recovery runbook. - Plan and implement future work (multi-party/milestone escrow, additional EVM chains) at your pace. Requirements: - Proven experience shipping Solidity contracts to mainnet. - Be resident in a country where Saifuro can hire. - Be available online from 14:00–17:00 UTC for team overlap. Nice to have: - Knowledge of storage layout, reentrancy and EVM-level signature verification. - Experience writing Rust/Anchor programs on Solana. - Familiarity with account abstraction (ERC-4337) and session keys for agents. - Knowledge of Circle USDC contracts and CCTP. - Security research, bounty experience or notable open-source contributions. Stack: Solidity, EVM, Base, Solana, USDC, Rust, Anchor, ERC-4337 Benefits: - S

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