Senior Software Engineer (React Native)

Job description

- Location: Madrid, Spain (Slightly Preferred) or Miami, FL — 100% In-Person (Daily in-office, ~25% flexible remote days). - Company Size: Early stage (3 full-time engineers). - Mission: Global, non-custodial web3 banking app with a flawless mainstream UX. ABOUT TUYO We are building a global, non-custodial app that works like a bank account inside your phone, removing all the complexity of crypto for the end user. - The Traction: $5M Seed round from top US/EU investors. Operating in 130+ countries with a viral Visa debit card product. - The Founders: Jorge Izquierdo (co-founder of Aragon, built core Ethereum infrastructure holding $30B+) and Alejandro Perezpayá (ex-Allfunds, $1.5T AUM bank). THE ROLE As one of our first founding-level engineering hires, you will own major parts of Tuyo’s React Native app end-to-end. We run a shared-ownership model across the whole stack—mobile is your entry point, not a boundary. We deeply care about product feel, animations, and delighting users. Key Responsibilities: - Own features end-to-end: from UI and state management to API integration, testing, and App Store releases. - Write clean, reliable TypeScript/JavaScript that scales. - Work directly with founders and designers; move fast from concept to production without waiting for perfect specs. - Debug tricky performance issues across iOS, Android, and backend layers. - Help set early engineering culture, architecture standards, and tooling. 🎯 REQUIREMENTS - 5+ years of professional software engineering experience. - Strong track record of shipping and optimizing production apps in React Native. - Deep proficiency in TypeScript / JavaScript. - Founder Mindset: High agency, extreme ownership, low ego. You care about product taste and user experience. - In-Person: Based in (or willing to relocate to) Madrid or Miami. Nice-to-Haves: - Experience with Expo, native modules, and mobile CI/CD. - Backend / Full-stack experience (Node.js, APIs). - Crypto/EVM familiarity (a plus, but genuine interest is enough). - Heavy use of AI tooling to multiply your engineering output. 📦 WHAT WE OFFER - High-tier base salary + meaningful founding-level equity (0.3%–0.6%). - Large individual AI-tooling budget. - Relocation support for non-local candidates.