Senior/Lead Smart Contract Engineer

Career Renew is recruiting for one of its clients a  Senior/Lead Smart Contract Engineer - this is a fully remote role for candidates based in the US or Europe (if they can overlap at least 6 hours with EST timezone). Salary range: 250-500K USD yearly. We are the largest decentralized perpetual exchange on Arbitrum, processing over $20 billion in cumulative trading volume since launching in October 2024. We enable leveraged trading of real-world assets—commodities, forex, indices, and stocks—alongside crypto, bringing global markets onchain with full self-custody. Our momentum:$150M daily trading volume$40M+ TVL with 10x growth in 202526% of Arbitrum's total DEX activityBacked by General Catalyst, LocalGlobe, and Susquehanna International GroupWe're a small team building critical infrastructure at the intersection of DeFi and traditional finance. Our backend systems process thousands of trades daily, integrate multiple oracle networks, and provide institutional-grade reliability for a protocol handling billions in volume.  The Role We're looking for an exceptional Senior or Lead Smart Contract Engineer to help scale our protocol as we expand to hundreds of markets and billions in daily volume. You'll work directly with our founding team (Harvard/Bridgewater/BlackRock backgrounds) to architect and implement critical protocol upgrades, new market mechanisms, and infrastructure that enables the next generation of onchain derivatives. This is not a junior role. We need someone who has built perpetual DEX smart contracts in production and understands the nuances of funding rates, liquidations, margin management, oracle integration, and keeper systems at scale.  Required Skills & Experience Must-Have Experience:3+ years building production smart contracts in SolidityDirect experience building smart contracts for a perpetuals DEX (this is non-negotiable)Deep understanding of perpetual futures mechanics: funding rates, margin systems, liquidation engines, and PnL calculationsProduction experience with oracle integration (Chainlink, Pyth, or custom oracles)Strong grasp of DeFi protocol design patterns and composabilityExperience with Hardhat, Foundry, or similar development frameworksTrack record of contracts handling significant TVL ($10M+) in productionTechnical Expertise:Advanced Solidity optimization techniques and gas efficiency patternsSmart contract security best practices and common vulnerability patternsExperience coordinating external security auditsUnderstanding of Layer 2 scaling solutions (Arbitrum, Optimism, etc.)Proficiency with automated testing and continuous integration for smart contractsSoft Skills:Ability to work independently with minimal oversight in a remote environmentStrong written communication for technical documentation and code reviewsComfortable with fast-paced startup environment and rapid iterationMust be available for 4 hours daily overlap with Eastern Time (9 AM - 6 PM ET) Why Join Us? Impact & Ownership:Be one of a small team building a protocol processing billions in monthly volumeOwn critical components of the protocol from design to deploymentShip code that directly impacts thousands of users and massive trading volumeInfluence product direction and technical architecture decisionsTechnical Challenge:Solve genuinely hard problems at the frontier of DeFi and TradFi convergenceWork with cutting-edge oracle infrastructure and Layer 2 technologyBuild systems requiring institutional-grade reliability and securityTackle novel problems around onchain RWAs that few others are solvingGrowth Trajectory:Join during explosive growth phase (10x TVL increase in 2025)Platform has demonstrated clear product-market fit with sustained tractionWell-funded with runway from top-tier VCs (General Catalyst, LocalGlobe, SIG)Positioned at the center of the expanding RWA narrative in cryptoTeam & Culture:Work with founders from Harvard, Bridgewater, and BlackRockSmall team means high impact and visibilityRemote-first with flexible working arrangementsOpen-source development practices and transparent collaborationCompetitive compensation including equity/tokensCompensation & Package+ tokens and equity