UI/UX Designer

Uni Systems; Brussel Hoofdstad; On-site; EUR 65,000 - 90,000; Full time

Job summary

Uni Systems is seeking an experienced UI/UX Designer to join the UniQue team. The role focuses on translating business and user requirements into accessible, visually coherent interfaces while balancing usability, functionality, and aesthetics.

You will analyze user journeys, create wireframes and prototypes, and design responsive web and mobile interfaces. You will also develop design systems and collaborate with developers and accessibility experts to ensure accurate implementation.

Qualifications

• 15+ years of UI/UX design and web interface development experience.
• Master's or Bachelor's degree in IT or related field.
• Strong UX research methods and user-centered design experience.
• Proficient in wireframing, prototyping, and design systems.
• Experience with accessibility WCAG standards and responsive web design.
• Proficient in front-end basics (HTML5, CSS3/SCSS, JavaScript) and modern frameworks.
• Experience with Confluence and Jira in Agile environments.

Responsibilities

• Translate requirements into intuitive UI/UX solutions balancing usability and aesthetics.
• Analyze user journeys via heuristic reviews, task analysis, and analytics.
• Create wireframes, mockups, and high-fidelity interactive prototypes.
• Design responsive web and mobile interfaces with clear IA and navigation patterns.
• Develop and maintain design system components, style guides, and assets.
• Plan usability evaluations and user testing with severity ratings and actionable suggestions.
• Prepare developer handoff deliverables and collaborate with developers and accessibility experts

Skills

User research

Persona creation

User journey mapping

UX analysis

Wireframes

Prototypes

Design systems

WCAG accessibility

Collaboration

Handoff documentation

Front-end basics

Figma

HTML5/CSS3/JS

React/Angular/Vue

Confluence/Jira

Education

Master's degree in information technology

Bachelor's degree in information technology

Tools

Figma

Adobe Photoshop

Adobe XD

Illustrator

HTML5

CSS3/SCSS

JavaScript

React

Angular

Vue.js

Confluence

Jira

Job description

At Uni Systems, we are working towards turning digital visions into reality. We are continuously growing and we are looking for a UI/UX Designer to join our UniQue team.

What will you be doing in this role?

• 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.
• Preparation of developer handoff deliverables and collaboration with developers and accessibility experts for accurate implementation.

At Uni Systems, we are working towards turning digital visions into reality. We are continuously growing and we are looking for a UI/UX Designer to join our UniQue team.

What will you be doing in this role?

• 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.

Requirements

• 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.

What do you need to succeed in this position?

• 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.

At Uni Systems, we are providing equal employment opportunities and banning any form of discrimination on grounds of gender, religion, race, color, nationality, disability, social class, political beliefs, age, marital status, sexual orientation or any other characteristics. Take a look at Diversity, Equality & Inclusion Policy for more information.