Frontend Developer

Role Overview

KOOP is seeking a Frontend Developer to contribute to the ongoing development of data.overheid.nl—the national platform that makes Dutch government data discoverable and reusable.

You will play a key role in the accessible redesign of the platform and help implement a future-proof, consistent, and reusable frontend built on React.

Key Responsibilities

• Translate user research insights into an accessible redesign.
• Implement the new UI following NL Design System principles and WCAG accessibility standards.
• Optimize the frontend and ensure seamless integration with backend systems.
• Deliver high-quality, maintainable, and well-documented code.
• Participate in the continuous development of data.overheid.nl, ensuring a reliable user experience for searching and reusing government datasets.

Requirements

Technical Skills

• React, JavaScript
• Experience with WCAG / DigiToegankelijk accessibility standards
• Experience integrating with REST APIs
• Knowledge of web security guidelines

Experience

• 3+ years frontend development
• 2+ years React experience

Preferred Skills

• Experience with Next.js
• Working with design systems / component libraries
• CI/CD (Git)
• Drupal experience
• UX knowledge
• SOLID principles
• SonarQube familiarity
• Cypress for testing
• SAFe Agile certification (or willingness to obtain)