- 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 TuyoWe are building a general, 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 RoleAs 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.#J-18808-Ljbffr

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