Research-led product design
I start from a business goal and from the field: interviews, data, observation. Then I design the screens that answer it, not the other way round.
The proofat.Café: new-user churn from 55% to 32%
PORTFOLIOCédric de La Chaise · Freelance Senior Product Designer
Product design that moves your business metrics.
8+ years of product design, research-backed. I start from a business goal (churn, activation, productivity), go to the field, then design and test the screens that move it.
8+years of product design, research-backed
100+studies shipped, from framing to decision
55% → 32%new-user churn after the at.Café redesign
8 → 1screens for Roland-Garros referees
Design decisions, backed by evidence.
Figma, prototypes, tests
Flows, wireframes and high-fidelity UI in Figma, interactive prototypes, and moderated tests with real users before anything ships.
The proofBetclic Poker: 4 priorities locked before v2Complex tools and workflows
Internal tools used under pressure: dense information, many roles, real-time constraints. Made clear for the people who use them all day.
The proofRoland-Garros: 8 screens to one toolAI-ready design systems
Tokens, components and rules written for humans and machines, so AI tools generate on-brand UI instead of drifting.
The proofThis site: one source of truth, testedFour cases, from the field to what shipped.
Internal tool
Scheduling a Grand Slam from one screen
8 → 1screens to one tool
8 courts tracked live
Roland-Garros (FFT)Read the case
Retention
Cutting new-user churn from 55% to 32%
55% → 32%new-user churn
~50 survey answers / week
at.Café (Y Combinator)Read the case
Retention
Keeping high-value players against the competition
5/5found decision time too short
4 priorities before v2
BetclicRead the case
Design system
An AI-ready design system
1source of truth (tokens.json)
0 raw colours outside tokens (tested)
This portfolioRead the case
They worked with me.
“He quickly understood our challenges and constraints, owned the subject and delivered a user journey that exceeded our expectations. The new solution is in production and a real success with users. I recommend Cédric without hesitation for his UX design skills.”
“We worked together on many projects. Cédric likes to dig deep and loves complex problems that span UX as a whole, including digital accessibility.”
Designer first, evidence always.
- Aug 2023 to now
Betclic Group
Poker & Casino. Figma mockups and prototypes tested with players, design recommendations and decisions with PMs on retention and engagement journeys.
- Jan to May 2023
Episto (freelance)
Consumer-insights SaaS. Led the experience design: prototypes, usability tests, design system.
- Dec 2021 to Dec 2022
at.Café (Y Combinator)
Hybrid-work B2B SaaS: research-led redesign of onboarding and home. New-user churn from 55% to 32%.
- Sept 2020 to Oct 2021
Fédération Française de Tennis
Designed the match-scheduling tool for Roland-Garros referees: field observation, prototypes, usability tests.
- 2017 to 2019
Viseo, then freelance
UX/UI design for Rue du Commerce (6M+ unique visitors): checkout, account, A/B tests. Direct Énergie, Harmonie Mutuelle, Neoness; via Viseo: HomeServe, PSA, SFR Sport.
- 2015 to 2017
La Smartphonerie (co-founder)
On-demand smartphone repair through a network of independent technicians.
FigmaFigJamFigma prototypingLookbackMazeDovetailAmplitudeClaude / AI design workflows
Available now · full-time · remote (CET)
Have a product problem worth solving?
Freelance missions, remote. Pick the format that fits your team; we start with a 30-minute call about your users and your metrics.
- Product design sprint2–4 weeks. One critical journey: research, Figma prototype, tested design ready for dev.
- Discovery + designA research-led redesign: understand why users leave, then design and validate the fix.
- Embedded senior designerFull-time, remote, inside your squad: Figma, prototypes, tests, design system.