Blockchain Engineer

As a Blockchain Engineer at ether.fi, you'll build and operate the next generation of DeFi yield vaults. You join the Nonce team, a small group with autonomy over every vault, rebalance, and protocol integration. Your work spans Solidity smart contracts, backend services that run safely 365 days a year, and hands-on vault operations, where the engineers who write the vaults are the ones who run them.

What you'll do

• Design, write, deploy, and configure yield vault smart contracts alongside the vault team
• Build vault tooling for executing trades, rebalancing across strategies, updating policies and whitelists, and admin configuration
• Extend the vault architecture as new yield strategies, assets, and chains come online
• Review teammates' contracts and tooling, and get reviewed in turn
• Prove the contracts do what they claim through unit and fuzz tests, invariants, and formal verification where it adds value
• Work with external auditors through review cycles and write contracts that are straightforward to audit
• Build and maintain critical 24/7 backend systems: the solver powering redemption flows, the NAV service pricing every vault position, and security monitoring
• Automate on-chain operations so allocation, harvesting, and rebalancing run reliably without manual intervention
• Own the protocol review pipeline: assess new protocols for risk and decide whether and on what terms to allocate capital
• Review and sign vault rebalancing transactions as a multisig signer
• Build monitoring and automation that catches broken oracles, depegs, stuck withdrawals, or bad allocations before users encounter them
• Participate as a security guardian across ether.fi's Web3 stack and operations

What you bring

• Strong production Solidity: clean, secure code designed around edge cases and failure modes
• Equally strong backend engineering: services, automation, and tooling that hold up running against real money
• Deep DeFi knowledge: you can read a protocol's docs and contracts, understand where yield actually comes from, and assess where it breaks
• 4+ years of industry engineering experience
• Shipped a real yield vault (ERC-4626, BoringVault-style, or your own architecture) and operated it after launch

Nice to have

• Experience at a vault platform, asset curator, or yield product with real TVL, either building vaults or curating allocations
• Hands-on experience with the strategies themselves: lending markets, LSTs and LRTs, basis and funding trades, stablecoin yield
• Audit or security review background
• Personal projects in this space: your own contracts, protocol audits, MEV bots, or extensive hours across DeFi protocols

What we offer

• Onsite 4 days per week at one of our global offices: NYC, Denver, or the Cayman Islands

About ether.fi

ether.fi is a decentralized finance platform offering a fully integrated, non-custodial suite of products (Stake, Liquid, and Cash) that bridges crypto utility with real-world convenience. The Nonce team builds ether.fi's DeFi yield vaults, deploying capital across lending markets, LSTs, LRTs, basis trades, and stablecoin strategies.