Senior Smart Contract 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 an innovative, rapidly growing crypto-native financial platform on a mission to put users in control of their wealth - making it easy to save, earn, and spend crypto. Positioned as a leading decentralized finance (DeFi) bank, ether.fi offers a fully integrated, non-custodial suite of products - Stake, Liquid, Cash, and Lend - that bridge crypto utility with real-world convenience. As we continue to scale, we’re actively hiring talented, mission-driven individuals who want to shape the future of finance from the ground up. Learn more at ether.fi.

Position Overview:

We’re looking for an exceptionally strong Senior Smart Contract Engineer with a security focus. You’ll design and build contracts that protect billions of dollars in user assets, review the changes that matter most, and help shape how we deploy, operate, and monitor our on-chain systems. You’ll work closely with engineering leadership and have real influence over our security practices from day one.

What You’ll Work On:

• Design, build, and own smart contracts/backend across Stake, Liquid, and Cash, with safety built into the design: limited blast radius, clear access control, and safe upgrade paths
• Review and audit contract changes before they reach mainnet, and serve as a go-to reviewer for the rest of the team
• Work with external auditors from scoping through fix verification
• Help design and improve how we sign transactions, including multisig structure, signer workflows, calldata and transaction hash verification, and timelock usage
• Improve how we run on-chain operations such as upgrades, parameter changes, role grants, fund movements, and bridges, so each follows a clear, reviewable path
• Build monitoring and alerting for contract state, privileged actions, oracle behavior, and anomalous flows, and contribute to incident response playbooks
• Propose and drive security practices and policies, and help other engineers write safer contracts

You Might Be a Fit If You:

• Led a smart contract team and the dapps operations
• Strong programming & design skill in Solidity
• Built sophisticated DeFi apps from scratch and operated
• Strong fundamentals in software engineering & enjoys problem solvings.
• Obsessed with Security: Care about secure smart contract code, and think deeply about edge cases and failure modes.
• Strong understanding of upgrade patterns, access control, oracle and risks, cross-chain messaging, and common DeFi attack vectors
• Experience operating with multisigs, timelocks, and governance flows in production
• Sound judgment on tradeoffs between safety and shipping speed, and the ability to explain them clearly
• You use AI tools heavily and reliably to review code, investigate issues, and automate operational work

Benefits:

• Competitive salary, performance-based incentives, and token allocation grant
• Health, dental, and vision insurance plans
• Collaborative and inclusive work culture
• Exposure to cutting-edge technologies in the blockchain and cryptocurrency space
• Global team with opportunity for travel and working out of our 3 offices around the world
• 4 weeks work from anywhere

Compensation Range: $120K - $230K