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Halian | Managed Services, Recruitment Agency & Contract Staffing

Frontend Developer - React.js (m/f/d)

Halian | Managed Services, Recruitment Agency & Contract Staffing
Luxembourg · Contract · Entry
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.

Frontend Developer - React.js in Luxembourg, Luxembourg

Key Skills

Ranked by relevance

reactjs gitlab cicd javascript typescript responsive react html5 scrum git ux
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Country Guide

Luxembourg

High-value international enterprise and fintech hub

Posted
Jan 14, 2026
Type
Contract
Level
Entry
Location
Luxembourg
Company
Halian | Managed Services, Recruitment Agency & Contract Staffing

Industries

Staffing Recruiting

Categories

Engineering Information Technology

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