Solidity & EVM Code Evaluation Engineer
Job Description
Work at IXO
Apply your experience in smart-contract engineering to paid work at IXO. You will develop realistic evaluation examples and review AI responses for technical correctness, clear reasoning and practical usefulness. The work calls for explanations that identify the actual defect or trade-off and show how a better answer would address it.
Responsibilities
• Evaluate contract examples involving token standards, DeFi mechanisms and access control.
• Review reentrancy and arithmetic risks alongside storage layout, gas usage and EVM execution reasoning.
• Assess UUPS, transparent and beacon upgrades, Foundry or Hardhat tests, fuzzing and invariants, and reasoning about oracles, slippage and MEV.
• Record the assumptions, supporting evidence and corrections needed for another specialist to follow your review.
Experience and expertise
• 4• years writing production Solidity smart contracts.
• Practical depth in ERC-20, ERC-721, ERC-1155, and major DeFi protocols.
• A thorough understanding of EVM gas mechanics and storage layout.
• Experience with security tools (Slither, Mythril, Echidna) and audit reports.
• Ability to work confidently with Foundry, Hardhat, and on-chain debugging.
• Familiarity with L2 ecosystems (Arbitrum, Optimism, Base, zkSync) is an advantage.
Working arrangements and pay
Remote work in these eligible locations: USA, UK, Germany, Singapore, UAE. Planning availability: Flexible, 10-25 hours/week. IXO will confirm the actual start and schedule before acceptance. Compensation is $120 • $190/hr USD. The agreed rate, delivery requirements and review criteria are confirmed before work begins.