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Sarah MillesSM

Sarah Milles

Supermalter

Senior UX Researcher / UX Designer - Lead UX/UI

€450/day
22 projects
Paris, FR
8-15 years

Average response time: 2 hours

Freelancer profile translated to English.
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About Sarah

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


👋 Hello!

I've been an UX designer and researcher since 2018, specializing in creating user-centered digital experiences through acombination of intuitive design and in-depth research.

Why work with me?

I help your products become more **effective, accessible, and engaging**, whether it's for websites, mobile apps, customer experiences, or complex interfaces.

My added value:

  • A human-centered approach forimpactful experiences.
  • Diverse expertise acrossvaried projects(e-commerce, intranets, mobile apps, unique interfaces, customer/digital experience).
*Strategic, results-orientedcollaboration.
  • Web accessibility and digital responsibility oriented approach

Areas of activity:

USER RESEARCH
Interviews, observation, user understanding methodology.

DATA ANALYSIS
Mandate analysis, problem definition, persona creation, experience mapping.

USER TESTING
Test plan creation, recruitment, and testing sessions.

ERGONOMICS
Interface ergonomics, user-centered design.

INFORMATION ARCHITECTURE
Content audit, key journey audit, recommendation report.

PROTOTYPING
Wireframes, sitemaps.
  • 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 spaces and rooms based on user needs. Reworking existing user flows to streamline the booking experience and improve overall service efficiency.

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

    My role involved understanding the needs of various stakeholders, analyzing current usage, and identifying barriers or opportunities for optimization in the assessment 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 needs.
    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 us to perfectly understand our different users and structure fluid and relevant journeys. What I particularly appreciated was her great ability to propose ideas and her global vision. She took the initiative to find and collaborate with a graphic designer specifically chosen to meet our very specific needs for this project. This synergy worked wonders. In the end, the mockups produced went far beyond our initial expectations, perfectly capturing 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, with a real ability to listen and great flexibility. I particularly appreciated her commitment and availability to adjust elements to meet the required level of quality. I am greatly satisfied with her work: she understood and precisely aligned with my high-end universe, respecting the codes and essential details for this positioning. A fluid 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 degree in Interaction Design
    Université Laval
    2018

Certifications

  • Google Analytics
    Google
    2020
    Data Science

Skill set

Categories