Senior Smart Contract Engineer — Security-Focused DeFi

ether.fi; New York (NY); Remote; USD 180,000 - 320,000; Full time

Benefits offered by this job

Token grant

Health insurance

Global offices

Travel opportunities

4 weeks work from anywhere

Job summary

ether.fi is seeking a Senior Smart Contract Engineer with a security focus to design, build, and secure on-chain contracts across Stake, Liquid, and Cash products. You will review changes with external auditors, shape signing and multisig workflows, and drive secure upgrade paths.

You will collaborate closely with engineering leadership to implement robust access control, timelocks, and governance flows, while improving monitoring, incident response, and deployment practices.

Qualifications

• Strong proficiency in Solidity and smart-contract design.
• Experience leading a smart contract team or dapps operations.
• Built sophisticated DeFi apps with secure patterns and safety-first mindset.
• Deep understanding of security, edge cases, and failure modes.
• Knowledge of upgrade patterns, access control, oracles, cross-chain messaging, and DeFi risks.

Responsibilities

• Design, build, and audit smart contracts across staking, lending, and collateral systems with strong security controls.
• Review contract changes with auditors, and mentor team on best practices.
• Collaborate with engineers to implement secure transaction signing, multisig, timelocks, and governance workflows.
• Enhance on-chain operations, upgrades, and parameter changes with clear, auditable processes.
• Develop monitoring/alerting for contract state, privileged actions, and abnormal activity.

Skills

Solidity

Smart contract leadership

DeFi development

Security mindset

Upgrade patterns

Tools

Auditing tooling

Job description

ether.fi is seeking a Senior Smart Contract Engineer with a security focus to design, build, and secure on-chain contracts across Stake, Liquid, and Cash products. You will review changes with external auditors, shape signing and multisig workflows, and drive secure upgrade paths.

You will collaborate closely with engineering leadership to implement robust access control, timelocks, and governance flows, while improving monitoring, incident response, and deployment practices.