UX/UI Designer

Our client is looking for a Senior UX/UI Designer to work on an initial 6 month freelance/B2B contract with potential for further extensions. This would be working 2 days per week onsite in Brussels with 3 days of remote work. Candidates would need to be fluent in French/Dutch as well as English.

Key responsibilities:

As a Senior UX/UI Designer, you will:

· Translate strategic objectives and value propositions into clear concepts, user journeys and flows.

· Design wireframes, high-fidelity interfaces and interactive prototypes for mobile, balancing user needs, business goals and technical constraints.

· Design and optimize conversational flows (chat, guided journeys, proactive messaging), ensuring clarity, relevance and trust.

· Design experiences optimized across touchpoints, aligning in-app experiences with web, physical stores, customer support, and assisted channels.

· Lead and conduct user research and usability testing, selecting appropriate methods to validate concepts and design solutions.

· Turn research, analytics, and customer feedback into clear design decisions and measurable improvements.

· Actively contribute to and evolve the design system and UX standards, ensuring consistency and quality across the app.

· Collaborate closely with product owners, analysts, developers, and other designers, while confidently challenging assumptions and proposing alternatives when needed.

· Present and defend design decisions to stakeholders and leadership.

· Proactively identify experience gaps and opportunities, particularly around onboarding, personalization, conversational flows, and AI-driven features.

· Collaborate with business and technical stakeholders to define where and how AI and conversation meaningfully improve the customer journey.

· Take full accountability for UX quality within your scope, following up on implementation and outcomes.

Experience & Background:

· Bachelor's degree in Computer Science, Information Systems, Graphic Design, Product development, Psychology or related field, or equivalent work experience.

· 5+ years of experience as a UX/UI designer, with proven end-to-end ownership of design work.

· Significant experience designing mobile apps in complex, large-scale environments.

· Strong background in user research, from exploratory research to usability testing.

· Experience designing for AI-powered products or assistants.

Skills & expertise:

· Excellent command of Figma for UX/UI design and prototyping.

· Strong understanding of mobile UX patterns, interaction design, and accessibility.

· Knowledge of Content Square, Adobe Analytics or other analytics tools to inform and validate design decisions.

· Solid understanding of Double Diamond and human-centred design principles.