Senior Full-Stack Developer (React + React Native & TypeScript)

Senior Full-Stack Developer

Location: Barcelona, Spain

Responsibilities

• Develop and maintain cross‑platform interfaces using React.
• Refactor and modernize components to improve speed, usability, and accessibility.
• Complete cross-functional tasks to improve and optimize the performance and design of our products and interfaces.
• Collaborate closely with a small, agile team.
• Take ownership of projects and features from concept to release.
• Drive architecture and code quality (patterns, refactoring, maintainability).
• Be ready to contribute quickly after a fair onboarding period.
• Improve performance & UX with measurable outcomes such as Core Web Vitals, load times, and responsiveness.

Qualifications

• Several years of production experience.
• Excellent TypeScript skills (clean types, refactor-safe code).
• Solid experience with React & React Native, especially hooks and modern component patterns.
• Understanding of responsive design and accessible web development.
• Knowledge of performance optimization, accessibility best practices, and testing tools such as Vitest, Playwright, and Maestro.
• Ability to work independently, communicate clearly, and deliver end‑to‑end solutions.

Preferred Knowledge / Technical Stack

• React Query (@tanstack/react-query): comfortable working with queries, mutations, caching, and existing API hooks.
• Zustand: confident with global state management in an existing codebase.
• Electron: familiarity with building and maintaining cross‑platform desktop applications.
• Native mobile development: experience with Kotlin and/or Swift.

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