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# UI/UX Designer

- **Company:** Uni Systems
- **Location:** Brussel, Belgium
- **Contract:** Permanent contract
- **Skills:** JavaScript (Programming Language), A/B Testing, Adobe Illustrator, Adobe Photoshop, Agile Methodology, Confluence, JIRA, HTML5, Browser Compatibility, Cascading Style Sheets (CSS), Collaborative Software, Drupal, Design of User Interfaces, Graphics Software, Human-Computer Interaction, Responsive Web Design, User-Centered Design, Web Content Accessibility Guidelines, Website Wireframe, WordPress, ReactJS, Adobe XD, Vue.js, AngularJS, Information Technology, Figma, Front End Software Development
- **Published:** October 22, 2026
- **Apply:** https://www.adzuna.be/details/5936684457

## About the Role

What do you need to succeed in this position?

 * Master's degree in information technology and a minimum of 15 years of relevant professional experience, or Bachelor's degree in Information Technology and a minimum of 17 years of relevant professional experience.

 * Very good command of English (Level B2 or higher), both written and spoken, according to the Common European Framework of Reference for Languages (CEFR).
 * Minimum 15 years of professional experience in UI/UX design and web interface development.
 * Proven experience applying user-centered design methodologies, including UX research, persona creation, user journey mapping, and user story analysis.
 * Experience planning, conducting, and evaluating usability tests, including remote testing, A/B testing, and hallway testing.
 * Strong experience creating wireframes, mock-ups, and interactive prototypes using Figma or similar design and prototyping tools.
 * Experience using graphic design tools such as Adobe Photoshop, Adobe XD, Illustrator, or equivalent solutions.
 * Proven experience developing responsive and user-friendly interfaces using HTML5, CSS3/SCSS, and JavaScript.
 * Experience working with modern front-end frameworks such as React, Angular, or Vue.js.
 * Experience performing responsive design validation and cross-browser compatibility testing across multiple devices and platforms.
 * Strong knowledge of W3C standards, web ergonomics, and SEO best practices related to interface design and development.
 * Proven experience designing accessible interfaces in compliance with WCAG accessibility standards.
 * Experience applying data protection, privacy, and security principles within UI/UX design activities.
 * Experience creating, maintaining, and governing design systems, including style guides, design tokens, and reusable component libraries.
 * Experience working in Agile environments and using collaboration tools such as Confluence and Jira.
 * Experience preparing design specifications, documentation, and developer handoff deliverables.
 * Ability to collaborate effectively with developers, business stakeholders, and accessibility experts to ensure accurate implementation of design solutions.
 * Experience with institutional design systems or CMS front-end theming platforms (e.g., Drupal or WordPress) will be considered an asset.
 * Experience working within an international public institution is highly desirable.

## Description

* Translate business and user requirements into intuitive, accessible, and visually coherent user interface solutions, ensuring an optimal balance between usability, functionality, and visual appeal.
 * Analyze user journeys and interface requirements through heuristic reviews, task analysis, and analytics-based insights to identify user needs, usability challenges, and opportunities for improvement.
 * Create wireframes, mock-ups, and low- to high-fidelity interactive prototypes to explore concepts, validate design decisions, and support iterative design refinement.
 * Design responsive web and mobile interfaces, defining clear information architecture, effective navigation patterns, and seamless interaction workflows to enhance the overall user experience.
 * Develop and maintain design system components, style guides, and graphical assets, ensuring consistency, scalability, and adherence to established design standards across products.
 * Plan and conduct usability evaluations and user testing activities, documenting findings and reporting issues with appropriate severity ratings, supporting evidence, and actionable recommendations.
 * Contribute to the definition of UI acceptance criteria and test scenarios, ensuring compliance with accessibility standards (WCAG) and compatibility across different browsers, devices, and screen sizes.
 * Preparation of developer handoff deliverables and collaboration with developers and accessibility experts for accurate implementation.