Über diese Senior Software Engineer (React Native) Stelle bei OnHires
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.
