Senior Front-End Developer (React) - ReferON

• 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.

• 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.
• 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.

• ? Learning and development opportunities and challenging tasks.
• ? Official employment following the laws of Spain/EU, registration of family members.
• ️ Relocation package (tickets, hotel for two weeks).
• ?️ ️ Company fitness corner in the office.
• ? Opportunity to develop language skills and partial compensation for language classes.
• ? Birthday celebration present.
• ? Time for proper rest and 22 working days of annual vacation.
• ? Breakfasts and lunches in the office (partially paid by the company).

Join BrainRocket and rock with us! ?

Join BrainRocket, a global company creating end-to-end tech products for clients across Fintech, iGaming, and Marketing. Our team of around 670 tech-savvy professionals delivers scalable projects and fosters a culture of professional growth.