Senior DeFi Engineer - Nexus Mutual

Role overview

A decentralized alternative to traditional insurance is hiring a Senior DeFi Engineer to help design and build the next generation of onchain risk and capital infrastructure. The position sits at the intersection of DeFi engineering, smart contract development, financial mechanism design, and protocol architecture, focusing on systems that securely handle real economic value at scale. It suits an engineer who wants to shape how the underlying protocol works rather than simply implement specifications handed to them.

Responsibilities

- Design and ship smart contracts and DeFi protocols that power risk, capital, staking, and coverage infrastructure - Build and refine mechanisms for capital allocation, liquidity provisioning, staking, pricing, incentives, and risk management - Partner with protocol, product, and research teams to translate complex financial mechanisms into robust onchain systems - Study existing DeFi protocols and primitives to surface integration, optimization, or novel design opportunities - Build integrations with DEXs, lending markets, liquidity venues, oracles, and other onchain infrastructure - Help set protocol architecture and economic design, write secure and gas-efficient Solidity, and develop testing, simulation, monitoring, and tooling around protocol behavior

Requirements

- 5+ years of software engineering experience, with significant production work on DeFi or blockchain systems - Strong Solidity and EVM expertise - Deep familiarity with DeFi primitives such as AMMs and DEXs, lending and borrowing, staking and restaking, liquidity provision, yield strategies, oracles, token economics, onchain governance, and capital allocation - Track record designing and deploying production smart contracts that handle meaningful economic value - Solid grasp of smart contract security, common attack vectors, EVM execution, gas optimization, transaction mechanics, and protocol composability - Experience with Foundry, Hardhat, or comparable tooling, plus disciplined testing across unit, integration, fuzz, invariant, and fork testing, and comfort working with onchain data and blockchain analytics

Nice to have

- Background in DeFi protocol or mechanism design, insurance, risk markets, prediction markets, or financial derivatives - Experience with liquidity management, AMM and pricing mechanism design, yield optimization, automated vault strategies, or asset management protocols - Exposure to risk modeling, quantitative finance, MEV and transaction-ordering dynamics, cross-chain protocols and messaging, or oracle design - Systems that have managed $100M+ in TVL or transaction volume, or contributions to major open-source DeFi protocols