Senior Blockchain Engineer

ether.fi; Denver (CO); On-site; USD 120,000 - 230,000; Full time

Benefits offered by this job

Competitive salary

Token allocation grant

Health, dental, and vision insurance

Job summary

ether.fi, a rapidly growing crypto-native financial platform, seeks a Senior Smart Contract Engineer focused on security to design, build, and audit on-chain contracts across Stake, Liquid, and Cash. You’ll influence security practices from day one and collaborate with engineering leadership to protect billions in user assets.

You’ll work on safe upgrade paths, access control, multisig and timelock workflows, and monitoring of on-chain operations, with a strong emphasis on DeFi risk mitigation

Qualifications

• 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 and problem solving.
• Obsessed with security: secure smart contract code and edge cases.
• Understanding of upgrade patterns, access control, oracle risks, cross‑chain messaging.
• Experience with multisigs, timelocks, and governance flows in production.
• Sound judgment on safety vs. shipping speed; able to explain tradeoffs clearly.
• Experience using AI tools to review code and automate ops.

Responsibilities

• Design, build, and own smart contracts and backend across Stake, Liquid, and Cash.
• Review and audit contract changes before mainnet deployment.
• Collaborate with external auditors from scoping to fix verification.
• Design and improve transaction signing, multisig structure, and timelock usage.
• Improve on-chain operations like upgrades and fund movements with clear processes.
• Build monitoring and alerting for contract state, privileged actions, and oracle behavior.
• Contribute to incident response playbooks and security policies.

Skills

Solidity

Smart contract design

DeFi experience

Security auditing

Multisig workflows

Timelocks

Cross-chain messaging

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 are 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