Senior Blockchain Engineer

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

About us:

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 atether.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