Junior UI/UX Designer (Freelance) – 3 Months – Brussels

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About the Role

We are seeking a Junior UI/UX Designer (Freelance) to join our client’s mission-critical project in Brussels. This is a unique opportunity to lay the foundations for a unified Design System that will power a complex ecosystem of applications used by both the public and internal teams. Your work will directly impact the daily experience of city agents and partners, shaping the digital backbone of a major European capital.

Why This Role Matters

Our client’s application ecosystem has grown organically, resulting in visual and ergonomic inconsistencies that hinder user experience and increase maintenance complexity. As a UI/UX Designer, you will be instrumental in creating a single source of truth for all interfaces, reducing UI/UX debt, ensuring accessibility, and enabling faster, more cohesive product development. Your contribution will set the standard for digital excellence and accessibility in the public sector.

What You’ll Be Doing

• Conducting a comprehensive audit and inventory of existing UI/UX across key applications, identifying inconsistencies and usability friction points.
• Defining visual foundations, including color palettes, typography, spacing systems, and other design tokens to establish a robust brand identity.
• Designing and building an accessible, scalable UI component library (UI Kit) in Figma, leveraging best practices such as auto-layout, variants, and variables.
• Ensuring all components are WCAG-compliant and responsive, with a desktop-first approach and seamless mobile consultation experience.
• Documenting clear usage guidelines for each component, integrating documentation directly in Figma or via external tools as needed.
• Collaborating closely with product management and development teams to ensure the Design System accelerates delivery and maintains consistency.
• Delivering all phases and outputs within a structured, phased project plan, from audit to final documentation.
• Working in a hybrid model, with a minimum of 2 days per week on-site in Brussels.

What We’re Looking For

• 1–3 years of experience in UI/UX design, ideally with exposure to complex, multi-application environments.
• Proven ability to audit and analyze existing UI/UX, identifying gaps and opportunities for improvement.
• Experience designing and implementing Design Systems or UI Kits, preferably for enterprise or institutional applications.
• Intermediate proficiency in Figma, including advanced features such as auto-layout, variants, variables, and shared libraries.
• Understanding of front-end technical constraints and collaboration with development teams.
• Knowledge of accessibility standards (WCAG 2.1 or 2.2) and a commitment to inclusive design.
• Experience documenting Design Systems and creating clear, actionable guidelines for usage.
• Familiarity with desktop-first business applications; experience with mapping or cartographic applications is a plus.
• Ownership mindset, strong problem-solving skills, and a drive to deliver impactful, future-proof solutions.
• Portfolio demonstrating relevant projects (Design Systems, UI Kits, business or institutional applications) is required.

Technical Skills

• Figma (intermediate to advanced)
• UI/UX audit and analysis
• Design System creation and documentation
• Component library development
• WCAG 2.1 accessibility standards
• Understanding of front-end development constraints
• Responsive design (desktop-first with mobile consultation)
• French (native or bilingual proficiency)
• Dutch and English (nice to have)

Other Requirements

• Freelance position with a fixed 3-month contract (full-time)
• Hybrid work model: minimum 2 days per week on-site in Brussels
• Experience working with public sector or government entities in Belgium/Europe is a plus
• Ability to provide a methodological note and planning for the project phases
• Prepared to submit a portfolio and up-to-date CV

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