React Native Engineer, Merchant Experience Mobile

United States Digital Space LLC; Barcelona; Presencial; EUR 50.000 - 80.000; Jornada completa

Descripción de la vacante

United States Digital Space LLC is seeking a Senior Mobile Engineer in Barcelona to lead the design and development of critical mobile features. You will own significant parts of the React Native codebase and work closely with product and design teams to deliver high-performance mobile experiences.

With a focus on AI integration and code quality, you will mentor junior engineers and drive architectural decisions that impact millions of users worldwide. A strong background in mobile development and TypeScript is essential for this high-impact role.

Formación

• 5+ years of professional mobile development experience, with a strong focus on React Native.
• Strong proficiency in TypeScript and modern JavaScript.
• Solid understanding of mobile app architecture and design patterns.

Responsabilidades

• Design and develop critical product features with cross-functional teams.
• Integrate AI and development tools to drive efficiency.
• Own architectural decisions for the mobile layer.

Conocimientos

React Native

TypeScript

JavaScript

Mobile app architecture

Herramientas

Expo

CI/CD tools (Fastlane, GitHub Actions)

Descripción del empleo

Who we are

About the company

the company is a financial infrastructure platform for businesses. Millions of companies—from the world's largest enterprises to the most ambitious startups—use the company to accept payments, grow their revenue, and accelerate new business opportunities. Our mission is to increase the GDP of the internet, and we have a staggering amount of work ahead. That means you have an unprecedented opportunity to put the global economy within everyone's reach while doing the most important work of your career.

About the team

We're a mobile engineering team based in Barcelona, focused on building world-class mobile applications that deliver excellent user experiences for the company merchants. React Native is at the core of how we build—it lets us move fast, share code across platforms, and ship high-quality experiences to millions of businesses worldwide without compromise.

As a Senior Mobile Engineer on our team, you'll help shape our React Native architecture, set the bar for engineering quality, and play a meaningful role in defining what great mobile development looks like at the company. This is a high-impact role where your decisions will be felt across the product—and across the millions of merchants who depend on our apps every day.

What you'll do

As a Senior Mobile Engineer, you'll own significant parts of our React Native codebase, lead architectural decisions, and help grow the team around you. You'll work closely with product, design, and cross-functional partners to deliver polished, performant mobile experiences.

Responsibilities

• Spearhead the design and development of critical product features, partnering with cross-functional teams to transform complex requirements into seamless, high-performance mobile experiences
• Champion the integration of AI and cutting-edge development tools to drive efficiency, elevate code standards, and cultivate a culture of AI-assisted engineering
• Own architectural decisions for the mobile layer—including navigation, state management, native module integration, and performance strategy
• Drive code quality through thorough code reviews, clear standards, and a strong testing culture
• Mentor and support junior and mid-level engineers, helping them grow technically and professionally
• Proactively identify and resolve performance bottlenecks across the JS thread, native bridge, and render pipeline, while scaling our mobile CI/CD infrastructure, release processes, and engineering tooling
• Act as the primary mobile platform liaison for internal teams, effectively translating requirements into well-scoped mobile initiatives while upholding rigorous standards for code quality and architectural integrity

Who you are

We're looking for someone who meets the minimum requirements to be considered for the role. If you meet these requirements, you are encouraged to apply. The preferred qualifications are a bonus, not a requirement.

Minimum requirements

• 5+ years of professional mobile development experience, with a strong focus on React Native
• Strong proficiency in TypeScript and modern JavaScript
• Solid understanding of mobile app architecture and design patterns (e.g., Flux, Redux, MobX, or similar)
• Proven expertise in React Native, encompassing component architecture, performance tuning, and a demonstrated ability to ship and maintain high-quality production applications at scale
• Excellent problem-solving skills and ability to communicate complex technical concepts clearly

Preferred qualifications

• Experience with Expo (managed or bare workflow)
• Experience designing and maintaining mobile CI/CD pipelines (e.g., Fastlane, GitHub Actions, Bitrise)
• Experience building or contributing to mobile SDKs or shared component libraries
• Experience with backend development (REST APIs and GraphQL)
• Contributions to open-source React Native libraries or the broader JS and mobile ecosystem
• Experience mentoring engineers and contributing to a team's engineering culture
• Familiarity with native iOS (Swift, UIKit) or Android (Kotlin, Android SDK) development
• Experience working in a remote-first or distributed engineering environment