Senior Smart Contract Engineer

About the TeamThis role is part of ourWorld Appteam, which since its launch in July 2023, has grown to 5 million monthly active users globally and is on track to become the largest crypto wallet in the world. The app enables users to obtain their unique Proof of Personhood throughWorld ID , claim Worldcoin Grants in eligible countries, and send money globally for free. World App has processed 60 million transactions since launch making it the largest crypto application on Optimism. We consume more than half of daily gas on Optimism.About the Role: Design, test, optimize, deploy, and maintainhigh-traffic smart contracts Design and build scalable, well abstracted, and robust APIs, libraries, and services to integrate on-chain functionality into World App.Handle complex smart contract functionalities to enhance transaction efficiency and security.Document system architectures and contribute to the strategic planning of our product offerings.About YouA crypto native engineerA deep understanding of Solidity, EVM, Wallets (Safe Account Abstraction), and L2 infrastructure (OP Stack)Experience with Ethereum tools (Foundry, Viem/Ethers/Ethers-rs)Experience building scalable backend systems in TypeScript/RustAn open-source blockchain project enjoyer3+ years of experience developing smart contracts or building blockchain applications.Nice-to-Have SkillsPassionate for onchain finance (DeFi) and the open webFamiliarity with ERC-4626You enjoy reading smart contracts in your free timeIf you don't think you meet all of the criteria below but still are interested in the job, please apply. Nobody checks every box, and we're looking for someone excited to join the team.By submitting your application, you consent to the processing and internal sharing of your CV within the company, in compliance with the GDPR.Pay transparency statement (for CA and NY based roles):The reasonably estimated salary for this role at TFH ranges from $216,000 - $275,000, plus a competitive long term incentive package. Actual compensation is based on factors such as the candidate's skills, qualifications, and experience. In addition, TFH offers a wide range of best in class, comprehensive and inclusive employee benefits for this role including healthcare, dental, vision, a 401(k) plan and match, life insurance, flexible time off, commuter benefits, professional development stipend and much more!