Front-End Developer (React)

We're looking for a Senior Front-End Developer (React) to join our team in our office in Valencia.

Requirements:

• 5+ years of professional front-end development.

• 3+ years using React (16.8+) in production environments.

• Strong proficiency in TypeScript, including strict-mode.

• Hands-on experience writing unit tests (Jest) and E2E tests (Cypress or Playwright), with CI integration.

• Experience with TanStack Query (or similar) for REST/GraphQL data-fetching.

• Experience with React Hook Form (or equivalent) and schema-based validation for complex forms.

• Knowledge of modern state management patterns using Zustand, Redux, or equivalent.

• Familiarity with modern build tooling like Vite (preferred), Webpack 5, or similar ES-modules pipeline.

• Intermediate level of English.

Would be a plus:

• Proven ability to refactor large front-end codebases—optimising data-fetch patterns, state management, and component architecture.

• Deep familiarity with modern data-grid libraries—preferably TanStack React Table 8 (virtualised rows, column meta, server-side filtering/pagination).

• Experience building UIs with Chakra UI or equivalent component libraries with custom theming.

• Familiarity with Storybook.

• Experience designing and implementing infrastructure for AI agent systems.

Responsibilities:

• Maintain and enhance existing React/TypeScript UIs, emphasizing stability.

• Build new features on top of an established system, following defined architecture and design patterns.

• Drive stability efforts - quickly resolve critical bugs and regressions, and proactively refactor fragile parts of the codebase.

• Collaborate closely with Product, Design, and Backend teams to deliver frontend features on schedule without sacrificing code quality.

• Participate actively in code reviews, mentor teammates, and help maintain high standards for code hygiene, CI quality, and technical documentation.

We offer excellent benefits, including but not limited to:

• 💻 Learning and development opportunities and interesting, challenging tasks.

• 📝 Official employment following the laws of Spain/EU, registration of family members.

• ✈️ Relocation package (tickets, staying in a hotel for 2 weeks).

• 🏋️ Company fitness corner in the office for employees.

• 📚 Opportunity to develop language skills and partial compensation for the cost of language classes.

• 🎁 Birthday celebration present.

• 🏝 Time for proper rest and 23 working days of Annual Vacation.

• 🍲 Breakfasts and lunches in the office (partially paid by the company).