Senior DeFi Smart Contract Security Engineer

ether.fi; New York (NY); On-site; USD 120,000 - 230,000; Full time

Benefits offered by this job

Token allocation grant

Health, dental, and vision insurance

Job summary

ether.fi is seeking an exceptionally strong Senior Smart Contract Engineer with a security focus to design, build, and audit on-chain contracts across Stake, Liquid, and Cash. You will influence security practices from day one and collaborate with leadership to protect billions in user assets.

You’ll review changes with external auditors, improve signing and multisig workflows, and help deploy safe upgrade paths while advancing on-chain operations and monitoring.

Qualifications

• Led a smart contract team and the dapps operations.
• Strong fundamentals in software engineering and problem solving.
• Obsessed with security: care about secure smart contract code and failure modes.
• Understanding upgrade patterns, access control, oracle risks, cross-chain messaging and common DeFi attack vectors.
• Experience operating with multisigs, timelocks, and governance flows in production.
• Judgment on safety vs shipping speed and ability to explain tradeoffs.
• Use of AI tools to review code and automate operations.

Responsibilities

• Design, build, and own smart contracts/backend across Stake, Liquid, and Cash with safe upgrade paths.
• Review and audit contract changes before mainnet and review for the team.
• Coordinate with external auditors from scoping to fix verification.
• Design and improve transaction signing workflows, multisig, timelocks, and governance flows.
• Improve on-chain operations like upgrades, parameter changes, and fund movements with clear processes.
• Build monitoring and alerting for contract state and anomalous flows, plus incident response playbooks.
• Drive security practices and policies and help engineers write safer contracts.

Skills

Solidity

Security

Job description

ether.fi is seeking an exceptionally strong Senior Smart Contract Engineer with a security focus to design, build, and audit on-chain contracts across Stake, Liquid, and Cash. You will influence security practices from day one and collaborate with leadership to protect billions in user assets.

You’ll review changes with external auditors, improve signing and multisig workflows, and help deploy safe upgrade paths while advancing on-chain operations and monitoring.