UX/UI Designer - Senior

Freelancer Opportunity

Job title: Sr. UX/UI Designer

Job location: Brussels, Belgium

Job duration: 2026-02-01 to 2026-07-31

Job weekly hours: 40 hrs./week

Job Description: Senior UX/UI Designer

A job at Proximus, you’ll find that everything revolves around the idea Think Possible. This means we always assume that something is possible, even if it seems impossible. Well, especially so. Call it a way of thinking that involves being open to a world of digital solutions that make our lives easier. And our way of working smarter.

We are looking for a highly motivated, Senior UX/UI Analyst Designer to join us on the exciting journey of our Design for product and sales journeys Chapter.

Mission

We are seeking a Senior UX/UI Analyst to lead the design and optimization of our onboarding journeys for our customers. This role requires a blend of technical expertise, user-centred design skills, and the ability to navigate into Design Systems. You will play a key role in ensuring our communication journeys are intuitive, performant, and tailored to meet the needs of our users while aligning with the business objectives.

Roles and Responsibilities

1.   User Experience Design

Design intuitive, user-friendly flows on our various communication platforms.

Map user flows, ensuring they are seamless, cohesive, and aligned with user needs and business goals.

Develop wireframes, prototypes, and design solutions to enhance usability.

Conduct usability testing and iterative design improvements.

2.   User Research

Lead user research activities, including interviews, surveys, and usability tests.

Synthesize user feedback into actionable insights to inform design decisions.

Document research findings and analysis in a clear, structured format, ensuring insights are shareable and accessible to stakeholders.

3.   Collaboration and Communication

Work closely with product owners, business analyst, tech lead, developers, and stakeholders to align design with business objectives.

Serve as a bridge between technical teams and users, ensuring seamless communication of requirements and solutions.

4.   Technical Expertise & accessibility

Analyze and understand the complexities of legacy IT systems.

Bring an expertise of Figma, auto layouts, templates management, file structure

Collaborate with development teams to ensure design feasibility within technical constraints.

Provide guidance on integrating modern UX practices into existing tools and ensuring compliancy with our Design System.

Provide requirements for accessibility

5.   Project Leadership

Lead UX/UI initiatives from concept to implementation.

Advocate for user-centered design principles across the organization.

Act as a mentor/ role model for our UX/UI Guild

Requirements

Minimum of 5 years in UX/UI design, with a proven track record of delivering impactful solutions for enterprise applications.

Experience working with Design System and development of components.

Ideally, previous experience as a front-end developer, with a deep understanding of Tokens, IT systems and architectures.

Familiarity with Agile or Scrum methodologies.

Skilled in conducting research and translating findings into design improvements.

Soft Skills:

Excellent communication and interpersonal skills.

Ability to work collaboratively in cross-functional teams.

Strong problem-solving skills with attention to detail.

Team player and collaborative

Tools and Skills:

Proficiency in design tools like Figma, Sketch, or Adobe XD.

Experience with prototyping and user testing tools.

Knowledge of analytics applications is a plus.

Languages

English (written and speaking) + French and/or Dutch.

This role is perfect for someone passionate about bridging the gap between technology and user experience, with a keen eye for detail and a strong technical foundation. Join us in shaping the future of our onboarding journeys!

Apply now and start your journey with Team Possible! We want to get to know you.

After your application, we will verify your profile and get back to you within 3

working days.

If you’re successful, you can expect the following steps:

An initial conversation with our recruiter - Swati Kumari

Interview with the Hiring Manager and the team.

Final decision

About Proximus

We are Team Possible turning tech into opportunities.

We are driven by four core pillars: "I care," "I make a difference," "I radically simplify," and "I embrace the future". This means you'll join a team that genuinely cares for customers and colleagues, is empowered to make a real impact, strives to radically simplify complex challenges, and is always looking ahead to embrace the future of technology. We believe in an inclusive and safe environment where everyone can thrive, offering extensive career development resources, including access to over 5,000 training modules and a minimum of 5 days of training per year, to help you continuously learn, grow, and tackle bold challenges with us.