Smart Contract Engineer

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:

- Salary $170,000–$220,000 (US range); outside the US paid in USD or USDC and calibrated to the local market.
- Equity: 0.30% of Saifuro, vesting.
- Health: 100% of medical/dental/vision premiums for US employees; 75% for dependents. Outside the US: local plan or $300/month toward private cover.
- 25 days paid vacation plus public holidays; company closed between Christmas and New Year.
- 14 weeks paid parental leave for any parent.
- Laptop and $1,000 toward your workspace.
- $1,500/year for learning (conferences included); company-paid events (6–8/year).
- Flexible hours with an overlap window of 14:00–17:00 UTC.

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