Senior Software Engineer (React Native)

OnHires; Madrid; Presencial; EUR 105.069 - 140.092; Jornada completa

Ventajas ofrecidas por este puesto de trabajo

Relocation support

Equity

Descripción de la vacante

OnHires is seeking a founding-level React Native engineer to own core parts of the mobile app end-to-end. You will focus on delivering smooth UX, performance, and scalable code across iOS and Android, collaborating closely with founders and designers.

This is an equity-friendly, early-stage opportunity in a fast-paced product environment. The role requires relocation or presence in Madrid or Miami, with a strong emphasis on product taste and user experience.

Formación

• 5+ years of professional software engineering experience.
• Strong track record shipping production React Native apps.
• Deep proficiency in TypeScript/JavaScript.
• Founder Mindset with high ownership and UX focus.

Responsabilidades

• Own features end-to-end from UI to API integration and App Store releases.
• Write clean, reliable TypeScript/JavaScript that scales.
• Collaborate directly with founders and designers; move fast from concept to production.
• Debug performance issues across iOS, Android, and backend layers.
• Help shape early engineering culture, architecture standards, and tooling.

Conocimientos

React Native

TypeScript/JavaScript

Ownership mindset

In-person Madrid/Miami relocation

Performance optimization

Herramientas

Expo

Node.js

APIs

Mobile CI/CD

Descripción del empleo

• 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.