Senior Smart Contract Engineer

As a Senior Smart Contract Engineer at ether.fi, you design and build contracts that protect billions of dollars in user assets across our Stake, Liquid, Cash, and Lend products. You review critical contract changes before mainnet deployment, work closely with engineering leadership, and shape our security practices from day one. ether.fi is a decentralized finance bank offering a fully integrated, non-custodial suite of products that bridge crypto utility with real-world convenience.

What you'll do

• Design, build, and own smart contracts across Stake, Liquid, and Cash with safety built into the design, including 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 engineering team
• Work with external auditors from scoping through fix verification
• Design and improve how you sign transactions, including multisig structure, signer workflows, calldata and transaction hash verification, and timelock usage
• Improve how you run on-chain operations such as upgrades, parameter changes, role grants, fund movements, and bridges, ensuring 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

What you bring

• Leadership experience on a smart contract team and dapp operations
• Strong programming and design skill in Solidity
• A track record building and operating sophisticated DeFi applications from scratch
• Strong fundamentals in software engineering and a passion for problem solving
• Obsession with security, caring deeply about secure smart contract code and thinking through edge cases and failure modes
• Strong understanding of upgrade patterns, access control, oracle 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, with the ability to explain them clearly
• Heavy and reliable use of AI tools to review code, investigate issues, and automate operational work

What we offer

• Competitive salary, performance-based incentives, and token allocation grant
• Health, dental, and vision insurance plans
• 4 weeks work from anywhere annually
• Global team with three offices around the world and opportunity for travel
• Collaborative and inclusive work culture with exposure to cutting-edge blockchain and cryptocurrency technologies

About ether.fi

ether.fi is a crypto-native financial platform and decentralized finance bank on a mission to put users in control of their wealth. The company offers a fully integrated, non-custodial suite of products spanning Stake, Liquid, Cash, and Lend that bridge crypto utility with real-world convenience.