Frontend Developer - React.js (m/f/d)
Halian | Managed Services, Recruitment Agency & Contract StaffingLuxembourg18 hours ago
ContractEngineering, Information Technology
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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
Mandatory
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.
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
- 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.
- 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.
- 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.
- Degree in Computer Science, Software Engineering, or equivalent experience.
- Proven experience as a Frontend Developer in a professional environment.
Key Skills
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