Front end Developer

About Proximus NXT

Proximus NXT Luxembourg supports all organizations in their digital transformation, by providing holistic ICT & Telecommunication solutions, as well as tailored managed services. With our partners and customers, we co-create opportunities and enable growth in a secure and sustainable manner. As a result of our unique expertise in next-gen IT services, mobile and advanced connectivity, we help our customers achieve their ambitions and realize their vision.

Together with them and our partners we implement sovereign and trusted solutions that make people work smarter.–

We are looking for a Frontend Developer specialized in 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
• 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 (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:

o Clean code and maintainability

o Reusable components

o Proper state and lifecycle management

o 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

A professional and stimulating work environment in the IT & telecom sector. Multiple career opportunities within the Proximus Group at national and international level, cutting-edge training in new technologies, a wealth of recognized expertise. We also offer an attractive salary package and many other benefits.

Our company is an equal opportunity employer, valuing diversity in all its forms. We firmly believe that each individual brings a unique richness to our teams, and we are committed to creating an inclusive environment where every voice counts.

If at the end of the process your application is successful, you will be asked to provide an extract from your criminal record. Your personal information will be handled in compliance with applicable data protection laws.