Senior Smart Contract Backend Engineer

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.

• A team of builders from leading Web3 organizations, including AAVE, Wormhole, Venus Labs, OKX, and others

• Backed by top investors such as Outlier Ventures, Manifold, DWF Ventures, and the Sei Foundation

• Partnered with industry leaders like Circle, OKX Wallet, Binance Wallet, Frax, Stargate, and more

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.

• Design, develop, and optimize DeFi protocols on EVM-compatible chains, emphasizing contract architecture, security, gas optimization, and up gradability

• Develop key backend and off-chain services in Go or Python, including monitoring systems, liquidation bots, and liquidity rebalancers

• Tackle cross-chain integration challenges, ensuring atomicity, data consistency, and reliable asset bridging in an asynchronous environment

• Rapidly iterate in an Agile environment and produce robust documentation and system architecture diagrams

• 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.

• 3+ years of smart contract development experience in Solidity, including familiarity with Open Zeppelin standards, Mainnet deployments, and audit collaboration

• Proficiency in Golang or Python, with a proven track record in developing high-concurrency or distributed systems

• Deep understanding of the mathematical models and business logic behind DeFi protocols (lending, AMMs, or derivatives)

• Mastery of development tools:
  Hardhat / Foundry and related testing frameworks

• Solid grasp of EVM internals, storage, memory, gas, and transaction lifecycle

• Experience with cross-chain messaging protocols (Layer Zero, Wormhole, Axelar, Chainlink CCIP)

• Understanding of MEV strategies (Flashbots, sandwich attack defense, Searcher bot development)

• Security background:
  Familiarity with DeFi attack vectors and defense strategies

• Contributions to open-source projects

• Prior experience in Web3, DeFi, or related ecosystems

• Competitive salary and token allocation

• Fully remote setup with autonomy and flexible hours

• Play a direct role in building 0→1 products

• Recruiter Screen

• Hiring Manager call

• Technical Round

• Final interview with the Founder

Apply Now: