Location: Madrid, Spain (Slightly Preferred) or Miami, FL — 100% In-Person (Daily in-office, ~25% adaptable 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: $5 M 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 $30 B+) and Alejandro Perezpayá (ex-Allfunds, $1.5 T 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 Type Script/Java Script that scales.



Work directly with founders and designers;
move fast from concept to production without waiting for perfect specs. Debug tricky performance issues across i OS, 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 Type Script / Java Script. 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. #J-18808-Ljbffr

📌 Senior Software Engineer (React Native) (Madrid)
🏢 OnHires
📍 Madrid