Senior Software Engineer

- 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.