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Sarah MillesSM

Sarah Milles

Supermalter

Senior UX Researcher - UX/UI Designer - Applied IA

€500/day
23 projects
Paris, FR
8-15 years

Average response time: 4 hours

Freelancer profile translated to English.
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About Sarah

  • 8 years of experience in UX Design
  • 4 years freelance
  • +50 digital products designed or improved
  • +2,000 hours of user research conducted (workshops, interviews, testing, audits, analyses)
  • +30 clients supported (startups, SMEs, large accounts, institutions)
  • Websites, e-commerce, mobile applications, business software, SaaS, internal tools

👋 Hello!

Hello!

I am a freelance UX Researcher and UX/UI Designer.

I help companies design useful, intuitive, and high-performing products through a user-centered approach.

Today, I also integrate artificial intelligence into my daily practice to improve the quality and efficiency of my interventions.

AI allows me, in particular, to speed up certain stages of the UX process:

• verbatim analysis
• research synthesis
• test protocol preparation
• benchmark
• qualitative data analysis
• hypothesis generation
• journey design
• design solution exploration

Each result is then verified, compared with real data, and enriched by UX analysis to ensure reliable and relevant recommendations.

I can also support your teams in integrating AI into their UX Research and UX Design practices.


My areas of intervention

User Research

  • Interviews
  • Observation
  • Surveys
  • Questionnaires
  • User Testing
  • Guerrilla Testing
  • Qualitative Data Analysis

UX Strategy

  • Personas
  • Experience Maps
  • Customer Journeys
  • Prioritization
  • Workshops
  • Design

Information Architecture

  • Wireframes
  • Prototypes
  • UX Writing
  • Ergonomics
  • Accessibility

AI Applied to UX

  • Assisted Data Analysis
  • Augmented Research
  • Assisted Design
  • UX Process Optimization
  • Team Training and Support
  • English

    Fluent

  • French

    Native or bilingual

Can work on-site
Paris (up to 50km), Paris (up to 50km), Bordeaux (up to 50km)

Experience

  • Your Personal Lab
    Application/Website Redesign
    FILM AND AV
    January 2025 - February 2026 (1 year and 1 month)
    UX redesign of the Your Personal Lab application, a platform for booking rooms and spaces according to user needs. Reworking existing journeys to streamline the booking experience and improve overall service efficiency.

    • Simplify booking journeys
    • Make the interface more intuitive and clearer
    • Reduce friction points at key stages
    • Improve understanding of the offering and availability
    • Increase conversion and user satisfaction
    • Establish a scalable UX foundation for future product evolutions
    User Experience Design UX Research UX/UI UX Designer
  • CNSA
    Continuous Improvement of Evaluation Software
    MEDICAL
    January 2025 - January 2026 (1 year)
    I worked with the CNSA on a continuous UX research mission to improve software used for evaluating disability levels.

    My role involved better understanding the needs of the various professions involved, analyzing current usage, and identifying obstacles or opportunities for optimization in the evaluation process.

    The goal was to design a more suitable tool, both in terms of interface and functional logic, to precisely and concretely address real-world situations.
    UX Research User Experience Design User Research UI Design
  • Maaé
    Lead UX/UI and UX Researcher
    October 2024 - December 2024 (2 months)
    As an active member of a pioneering collective combining UX research and UX writing, I contribute to defining a unique and innovative methodology, making us one of the first collectives – and soon an agency – to adopt this integrated approach.

    As UX Researcher and Lead UX/UI, I supervised user research and solution design. This project allowed me to leverage my skills in management, team support, and stakeholder collaboration.
    UX Designer UX Research Lead UX Lead UI

Reviews

5.0

Out of 11 ratings

VivienV

Vivien

CTO - INDIVINE SAS

Reviewed on 6/1/2026

I had the pleasure of entrusting Sarah with the design of our application. Her work was remarkable at all levels. The UX research phase was masterfully conducted, allowing for a perfect understanding of our different users and the structuring of fluid and relevant journeys. What I particularly appreciated was her strong ability to propose ideas and her global vision. She took the initiative to find and collaborate with a specifically targeted graphic designer to meet our very specific needs for this project. This synergy worked wonders. In the end, the produced mockups went far beyond our initial expectations, perfectly reflecting the calming atmosphere we envisioned. I recommend Sarah without hesitation for her professionalism, her listening skills, and her talent!
E

Emilie

UX/UI designer - LAMAJOR

Reviewed on 4/20/2026

Sarah was very involved throughout the project, showing real listening skills and great flexibility. I particularly appreciated her commitment and availability to adjust elements to meet the required level of quality. I am very satisfied with her work: she understood and precisely aligned with my high-end universe, respecting the codes and details essential to this positioning. A smooth and professional collaboration that I recommend without hesitation.

Recommendations

FU
FU
FU
Former user and 2 other people have recommended Sarah

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Education

  • Master's degree
    Université Laval
    2018
  • Master's in Interaction Design
    Université Laval
    2018

Certifications

  • Google Analytics
    Google
    2020
    Data Science

Skill set

Categories