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Frontend Developer - React.js (m/f/d)
Contract
Luxembourg, Luxembourg
14.01.2026
We are looking for a Frontend Developer specialized in React.js to design, build, and maintain modern, scalable web applications. You will work closely with product owners, UX designers, and backend engineers to deliver high-quality, testable, and maintainable user interfaces.
You will contribute to the full development lifecycle, from design and implementation to testing, CI/CD integration, and continuous improvement.
Key Responsibilities
• Design and develop responsive, high-performance user interfaces using React.js.
• Translate UX/UI designs and functional requirements into clean, reusable code.
• Apply frontend architecture best practices (componentization, separation of concerns, state management).
• Write unit tests and component tests to ensure code reliability and regression prevention.
• Participate in code reviews and enforce coding standards.
• Use GitLab for version control, merge requests, and CI/CD pipelines.
• Collaborate with backend teams to integrate REST APIs and asynchronous services.
• Optimize applications for performance, accessibility, and security.
• Actively contribute to continuous improvement of development processes and tooling.
Technical Skills & Requirements
Mandatory
• Strong experience with React.js (functional components, hooks).
• Proficiency in JavaScript (ES6+) and TypeScript.
• Solid understanding of HTML5, CSS3, and modern layout techniques (Flexbox, Grid).
• Experience with Git and GitLab workflows (branches, merge requests, CI pipelines).
• Strong experience in unit testing (Jest, React Testing Library or equivalent).
• Knowledge of frontend development best practices:
- Clean code and maintainability
- Reusable components
- Proper state and lifecycle management
- Error handling and logging
Nice to Have
• Experience with CI/CD pipelines in GitLab.
• Familiarity with linting and quality tools (ESLint, Prettier).
• Knowledge of accessibility standards (WCAG).
• Experience with performance optimization and browser debugging tools.
• Exposure to Agile / Scrum methodologies.
Quality & Engineering Practices
• Write testable and well-documented code.
• Maintain high unit test coverage.
• Follow coding standards and naming conventions.
• Ensure security and performance best practices.
• Actively participate in technical reviews and retrospectives.
Soft Skills
• Strong communication and collaboration skills.
• Ability to work autonomously and take ownership.
• Attention to detail and quality-driven mindset.
• Willingness to learn and adapt to evolving technologies.
Education & Experience
• Degree in Computer Science, Software Engineering, or equivalent experience.
• Proven experience as a Frontend Developer in a professional environment.
You will contribute to the full development lifecycle, from design and implementation to testing, CI/CD integration, and continuous improvement.
Key Responsibilities
• Design and develop responsive, high-performance user interfaces using React.js.
• Translate UX/UI designs and functional requirements into clean, reusable code.
• Apply frontend architecture best practices (componentization, separation of concerns, state management).
• Write unit tests and component tests to ensure code reliability and regression prevention.
• Participate in code reviews and enforce coding standards.
• Use GitLab for version control, merge requests, and CI/CD pipelines.
• Collaborate with backend teams to integrate REST APIs and asynchronous services.
• Optimize applications for performance, accessibility, and security.
• Actively contribute to continuous improvement of development processes and tooling.
Technical Skills & Requirements
Mandatory
• Strong experience with React.js (functional components, hooks).
• Proficiency in JavaScript (ES6+) and TypeScript.
• Solid understanding of HTML5, CSS3, and modern layout techniques (Flexbox, Grid).
• Experience with Git and GitLab workflows (branches, merge requests, CI pipelines).
• Strong experience in unit testing (Jest, React Testing Library or equivalent).
• Knowledge of frontend development best practices:
- Clean code and maintainability
- Reusable components
- Proper state and lifecycle management
- Error handling and logging
Nice to Have
• Experience with CI/CD pipelines in GitLab.
• Familiarity with linting and quality tools (ESLint, Prettier).
• Knowledge of accessibility standards (WCAG).
• Experience with performance optimization and browser debugging tools.
• Exposure to Agile / Scrum methodologies.
Quality & Engineering Practices
• Write testable and well-documented code.
• Maintain high unit test coverage.
• Follow coding standards and naming conventions.
• Ensure security and performance best practices.
• Actively participate in technical reviews and retrospectives.
Soft Skills
• Strong communication and collaboration skills.
• Ability to work autonomously and take ownership.
• Attention to detail and quality-driven mindset.
• Willingness to learn and adapt to evolving technologies.
Education & Experience
• Degree in Computer Science, Software Engineering, or equivalent experience.
• Proven experience as a Frontend Developer in a professional environment.