Product Engineer, Fullstack

Tuyo; Madrid; On-site; EUR 60,000 - 100,000; Full time

Benefits offered by this job

Equity 0.3%–0.5%

On-site in Madrid

Generous AI tools budget

Competitive salary €60k–€100k

Job summary

Tuyo is building a self-custodial crypto money app that blends wallets, stablecoins, banking rails and AI with user-owned keys. We operate with a small, product-minded team serving thousands globally, shipping features from idea to production across React Native and backend services.

We value engineers who own end-to-end features, collaborate with founders, and care about security, reliability, and user experience. This Madrid-based, on-site role offers equity and a competitive salary.

Qualifications

• Strong JavaScript/TypeScript production experience.
• Ability to own a feature across the stack.
• Excellent product judgment and taste.
• Interest in AI and applying it to work.
• Clear communication and collaboration.

Responsibilities

• Own features end to end, working directly with the founders and design.
• Build across the React Native app, backend and integrations as needed.
• Build tools and experiences for AI agents with clear permissions and approval flows.
• Make complex money flows feel simple; ensure security, reliability and performance.
• Keep the codebase practical and help set engineering standards.

Skills

JavaScript/TypeScript

Full-stack development

Ownership

AI tooling

Clear communication

Tools

React Native

Expo

Backend APIs

Job description

About Tuyo

https://tuyo.com exists to help people progress in their financial life. It is a self-custodial crypto money app, bringing together wallets, stablecoins, banking rails and cards while customers control their keys and funds.

We are a small, product-minded team serving thousands of customers in more than 130 countries. We are venture-backed, have raised our seed round, and have years of runway. Our founders are https://x.com/izqui9 , who cofounded https://aragon.org/ , and https://x.com/aperezpaya , previously an executive at https://allfunds.com/ .

The job

You build Tuyo. You help decide how it works and take features from an idea to production. Your strengths may be in frontend or backend; your work reaches across both, including our React Native app.

With https://tuyo.com/ai , customers can connect compatible AI agents to their account and use them to understand their finances, identify opportunities, and prepare payments or trades. This matters because it puts Tuyo at the center of a new way of managing money: customers get the convenience and intelligence of AI without giving up control.

Product engineering at Tuyo

Product engineers here own a customer problem and follow it through the stack. We work as fullstack as possible: shape the experience, build the interface, change backend logic, connect services, test and ship. Keeping that context together helps us make better decisions.

We have a very high bar for product quality. We want people who care deeply about what they build: how it feels to use, how reliably it works, and whether it makes someone’s life better.

Everyone has strengths. Bring depth in mobile, frontend, backend or infrastructure, and curiosity about the rest. We help each other through unfamiliar parts. You can grow your breadth here; we don’t expect equal expertise everywhere.

We invest heavily in AI tools and give engineers a very generous budget to use them. There’s a limit, but nobody’s found it yet.

Use AI to learn, build and test. Help the team become better at it by sharing workflows and improving our tools. You remain responsible for understanding and validating what you ship.

What you will do

• Own features end to end, working directly with the founders and design.
• Build across our React Native app, backend and integrations as the problem requires.
• Build tools and experiences for AI agents, with clear permissions and approval flows.
• Make complex money flows feel simple. Care about security, reliability, performance and the details people notice.
• Keep the codebase practical, improve how we work, and help set the engineering standard.

What you will bring

• Engineering depth. Strong JavaScript/TypeScript and experience building production interfaces, APIs or backend systems. You’re comfortable following a feature across the stack.
• Ownership. You can take an ambiguous problem, make sound tradeoffs, debug it and get it shipped.
• Product judgment and taste. You care about how something works and feels, and can explain your decisions.
• AI in your daily work. You’re hungry to keep learning and getting better. You explore the edge of what AI makes possible, test new tools and approaches in real work, and share what you learn.
• Clear communication. You explain tradeoffs, ask for help and make the people around you better.

Useful experience

Experience with wallets, stablecoins, onchain transactions or consumer products is useful. React Native or Expo is a bonus.

Location and compensation

• Location: Madrid, working together in person.
• Employment: Full-time.
• Annual salary: €60,000–€100,000.
• Equity: 0.3%–0.5%.

Before you apply

We work hard and move quickly. This is an incredibly exciting time to build Tuyo: self-custody and AI are opening up new ways to help people with their money. We’re here to do the best work of our lives, and we want teammates who are just as excited about the mission and the work.

Show us what you’ve built, tell us what you owned, and why you want to build Tuyo.