Senior Software Engineer (React Native)
Primary stack
Nice to have's
Job description
About the Position
Senior Software Engineer (React Native)
We are looking for a Senior Software Engineer (React Native) to join Tuyo, a pioneering company building a global, non-custodial web3 banking app with a flawless mainstream UX.
Location
Madrid, Spain or Miami, FL
Employment Type
Full time
Location Type
On-site
Department
Mobile Development
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.
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 Have
- 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.
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.
© OnHires. This job description was sourced from the employer's public career page. TheJob is not the employer — we index the posting and route candidates to the source. All content rights and hiring decisions belong to the employer.
OnHires was founded in 2021 by Vasyl Grygorovych and Viktoriia Ihnatieva to help companies find and hire the best tech talent the world offers.As business owners, both Victoria and Vasyl were frustrated by how difficult and costly it was to quickly scale development teams. Having lived in multiple countries and traveled to every continent in the world, they realized that great talent could be found anywhere. At the same time, they realized that it’s difficult for both companies and talent to find each other outside of their own geographical location. In an effort to solve this problem, Viktoriia and Vasyl founded OnHires.You can read more about their background here:🚀 Our missionTo connect great companies with even greater talent. We believe that talent can be found anywhere but this is not always the case with opportunities. We are on a mission to bridge that gap and create equal opportunities for everyone. To achieve this, we are building an agency that will help companies unlock global talent.
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