Smart Contract Engineer (Solidity, EVM)

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.

• 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.

• 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.

• 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.

Solidity, EVM, Base, Solana, USDC, Rust, Anchor, ERC-4337

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