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Product Designer & User Researcher H/F - Lille

Smile đŸ‡«đŸ‡· Lille, Nord, France

Full-time Senior

Lead end-to-end UX and UI product design, from research planning and user studies through analysis, visual design, and interactive prototyping. Evaluate designs through usability testing and analytics, prioritize product opportunities, facilitate collaborative workshops, and work closely with developers and Product Managers.

Responsibilities

  • Own end‑to‑end UX/UI delivery within squads, aligning product success with business KPIs
  • Define research plans, recruit participants and conduct qualitative studies
  • Analyse data and produce impact‑driven deliverables such as personas and journey maps
  • Create visual designs and interactive prototypes up to high fidelity
  • Design and run usability testing protocols, analyse friction points and iterate
  • Leverage quantitative data (Hotjar, Mixpanel) to inform design decisions
  • Challenge product backlogs, define opportunities and prioritize features
  • Facilitate co‑design workshops and synthesize insights for decision makers
  • Collaborate daily with developers and product managers to ensure feasibility and quality

Requirements

  • Minimum 5 years of product design experience, preferably agency background
  • Expertise in the complete UX + UI chain
  • Ability to define research plans, conduct interviews, focus groups, surveys and ethnographic studies
  • Skill in creating personas, experience maps, user journeys and strategic reports
  • Proficiency in high‑fidelity visual design and interactive prototyping
  • Experience designing and executing usability tests (guerrilla, moderated, unmoderated)
  • Ability to use quantitative analytics tools such as Hotjar or Mixpanel
  • Capability to prioritize backlog items based on user and business value
  • Facilitation skills for collaborative workshops and clear stakeholder communication
  • Autonomous 360° profile comfortable with rapid iteration and continuous improvement

Benefits

  • Company health insurance partially covered
  • Public transport subsidy (50%)
  • Minimum of 9 days of paid leave per year
  • Vacation bonus
  • Meal vouchers (€10, 50% covered)
  • Career development opportunities

Key Skills

UX research User interviews Focus groups Surveys Ethnographic studies Persona creation Experience mapping User journey mapping Strategic reporting High‑fidelity visual design Interactive prototyping Usability testing (guerrilla, moderated, unmoderated) Hotjar Mixpanel Data‑informed design Product backlog prioritization Workshop facilitation Cross‑functional collaboration Agile methodology Design systems Communication Problem solving Strategic thinking

About Smile

We are Technology experts & Business partners. AI powered. Enabling digital autonomy. Smile is a European digital services group operating in 7 countries and bringing together 1,500 people. Our value proposition is built around three accelerators across all our areas of expertise: - Digital Autonomy : we provide solutions built on open source or European sovereign software, designed to keep full control over data, infrastructure and technology choices. - Agentic AI : native and integrated from day one, in every project, every team, every method, it accelerates transformation, optimises operations and unlocks new sources of business value. It is the backbone of everything we deliver. - The Factory : our factories bring together multidisciplinary teams, experienced in agile methods, capable of delivering exactly what they have promised. We operate across five domains: AI & Data, Customer Experience, Business Applications, Cloud Transformation & Management and Product & Industrial Sy

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