Job Title: Senior Smart Contract & Backend Engineer

Company Name: Yei Finance

Job Details: RemoteFull,Time

Job Url: https://hiring.cafe/viewjob/b25gf2uattst8vxh

Job Description: Posted 2mo agoSenior Smart Contract & Backend Engineer@ Yei FinanceView All JobsWebsiteUnited StatesRemoteFull TimeResponsibilities:Design protocols, Develop backend, Integrate cross-chainRequirements Summary:3+ years in smart contract development (Solidity) with OpenZeppelin standards; backend experience in Go or Python; experience with EVM, audit collaboration, and DeFi protocols; familiar with testing and development tools like Hardhat/Foundry.Technical Tools Mentioned:Solidity, Go, Python, Hardhat, Foundry, OpenZeppelin
About the project:Yei Finance is a decentralized, non-custodial money market protocol built on the Sei network, designed to provide innovative and flexible financial solutions. It offers users competitive yield, empowers them to borrow through over-collateralized or flash loans, and enables them to manage risks with advanced tools—all while leveraging Sei’s speed and cost.Clovis is the latest product by Yei Finance, which reached more than $400M TVL at ATH, generated $5.5M in protocol revenue over the past year, and became the largest protocol on Sei. Yei also launched the first lending-boosted DEX on Sei, where YeiSwap compounds YeiLend yields to drive $230M+ in monthly trading volume and $147M in bridge flow. Now, Clovis will expand this proven model by becoming multichain, and positioning itself as the cross-chain prime brokerage layer for DeFi.Who we are:A team of builders from leading Web3 organizations, including AAVE, Wormhole, Venus Labs, OKX, and othersBacked by top investors such as Outlier Ventures, Manifold, DWF Ventures, and the Sei FoundationPartnered with industry leaders like Circle, OKX Wallet, Binance Wallet, Frax, Stargate, and moreThe Opportunity:We are seeking an experienced Senior Engineer to join our core development team to lead the design and implementation of our next-generation cross-chain lending protocol. This role focuses on smart contract security and architecture and the development of critical off-chain services that ensure the protocol’s efficiency and robustness.What You’ll Do:Design, develop, and optimize DeFi protocols on EVM-compatible chains, emphasizing contract architecture, security, gas optimization, and upgradabilityDevelop key backend and off-chain services in Go or Python, including monitoring systems, liquidation bots, and liquidity rebalancersTackle cross-chain integration challenges, ensuring atomicity, data consistency, and reliable asset bridging in an asynchronous environmentRapidly iterate in an Agile environment and produce robust documentation and system architecture diagramsWho You Are:Startup-Oriented: Comfortable operating in fast-moving, ambiguous environments and taking ownership from day one.Mission-Driven: Motivated by building innovative DeFi products.Collaborative: Communicates clearly and works effectively across both synchronous and asynchronous teams.Product-Quality Focused: Cares deeply about user experience and the details that make a product exceptional.Autonomous: Able to manage your own time, priorities, and outcomes in a fully remote setup.Qualifications:3+ years of smart contract development experience in Solidity, including familiarity with OpenZeppelin standards, Mainnet deployments, and audit collaborationProficiency in Golang or Python, with a proven track record in developing high-concurrency or distributed systemsDeep understanding of the mathematical models and business logic behind DeFi protocols (lending, AMMs, or derivatives)Mastery of development tools: Hardhat / Foundry and related testing frameworksSolid grasp of EVM internals, storage, memory, gas, and transaction lifecycleNice-to-haves:Experience with cross-chain messaging protocols (LayerZero, Wormhole, Axelar, Chainlink CCIP)Understanding of MEV strategies (Flashbots, sandwich attack defense, Searcher bot development)Security background: Familiarity with DeFi attack vectors and defense strategiesContributions to open-source projectsPrior experience in Web3, DeFi, or related ecosystemsOffer:Competitive salary and token allocationFully remote setup with autonomy and flexible hoursPlay a direct role in building 0→1 productsProcess:Recruiter ScreenHiring Manager callTechnical RoundFinal interview with the Founder