User Experience Designer

Job title: UX Designer

Location: Brussels, Belgium(Hybrid, 2-3 days per week onsite)

Duration: ASAP- 6 months with possible extension

Languages: Dutch or French and English

JOB DESCRIPTION:

we are looking for a Senior UX/UI Designer to play a key role in shaping the future of the Proximus+ app as a trusted omnichannel hub for our customers.

You will work within the Ecosystem Design Chapter and take ownership of key app experiences. Your mission is to help Proximus+ deliver simpler, more personalized, and more proactive experiences in line with customer needs. This role is ideal for a senior app designer who thrives in autonomy, is comfortable navigating ambiguity, and wants to actively influence how AI, personalisation and conversation shape the future of the Proximus+ app.

Key responsibilities:

As a Senior UX/UI Designer, you will:

· Drive the overall UX/UI and experience of the Proximus+ mobile app.

· 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.

Mindset & ways of working:

We are specifically looking for someone who:

· Brings an analytical and data-driven mindset.

· Is deeply customer-focused, with a hands-on, pragmatic, and can-do mentality.

· Is a strong facilitator, able to lead workshops, align diverse stakeholders, and guide teams toward shared decisions.

· Has strong stakeholder management and influencing skills, able to navigate differing opinions and push back constructively.

· Thrives in complex and evolving contexts, able to stay effective in the face of ambiguity, change and bring clarity.

· Works confidently autonomously, taking initiative and ownership while keeping stakeholders aligned.

· Communicates clearly and confidently, adapting their message to different audiences.

· Demonstrates strong planning and organizational skills, coordinating projects across multiple tribes and departments.

· Is curious, future-oriented, and motivated by shaping what comes next, especially in the context of AI and evolving digital experiences.

Nice to haves:

· Experience with service design and cross-channel journeys.

· Experience in telecommunications or similarly complex industries and corporate environments.

· Familiarity with Agile product development environments.