Senior Security-Focused Smart Contract Engineer (DeFi)

Ether.fi; United States; Remote; USD 180,000 - 260,000; Full time

Benefits offered by this job

Token allocation grant

Health, dental, and vision insurance

Travel opportunities

Work from anywhere (4 weeks)

Job summary

ether.fi is seeking an exceptionally strong Senior Smart Contract Engineer with a security focus to design and build on-chain contracts that protect user assets. You will review critical changes, work with auditors, and shape how we deploy, operate, and monitor our on-chain systems.

You'll influence security practices from day one, collaborate with leadership, and help design robust multisig and timelock structures, upgrade paths, and governance flows across DeFi products.

Qualifications

• Expertise in Solidity and smart contracts for DeFi applications.
• Strong security focus with experience reviewing/auditing contract changes.
• Familiarity with multisig/timelock structures and governance flows.
• Experience with upgradeable contracts and cross-chain messaging.

Responsibilities

• Design, build, and own safe smart contracts across Stake, Liquid, and Cash with secure access controls.
• Review and audit contract changes before mainnet deployment; serve as reviewer for team.
• Collaborate with external auditors from scoping to verification.
• Improve transaction signing, multisig workflows, timelocks, and verification processes.
• Enhance on-chain operations for upgrades, parameter changes, and fund movements with clear guardrails.
• Develop monitoring/alerting for contract state, privileged actions, oracle behavior, and anomalies; contribute to incident playbooks.
• Drive security practices and help engineers write safer contracts.

Skills

Solidity

Security-focused

Auditing

Multisig

Timelocks

Governance flows

Upgrade patterns

Cross-chain messaging

DeFi knowledge

Problem solving

AI-assisted review

Job description

ether.fi is seeking an exceptionally strong Senior Smart Contract Engineer with a security focus to design and build on-chain contracts that protect user assets. You will review critical changes, work with auditors, and shape how we deploy, operate, and monitor our on-chain systems.

You'll influence security practices from day one, collaborate with leadership, and help design robust multisig and timelock structures, upgrade paths, and governance flows across DeFi products.