Timothée Jezek

Case study

Pro Santé Identité

UI AI

The app that certifies caregivers' digital identity, tested twice: satisfaction went from 3.4 to 4.3 out of 5.

Role
UI designer, UX/UI duo
Period
2025 → 2026
Context
French Digital Health Agency (ANS), via Atos / Eviden
Tools & stack
Figma · Interactive prototypes · Claude Code · Figma Make

Pro Santé Identité (PSI) is the mobile app where a French health professional gets their digital identity certified and obtains their e-CPS: the dematerialised professional card that unlocks sensitive health services, such as DrimBox, the national medical imaging exchange. Nobody chooses to use an identity service: you go through it because you must, and security will always come before comfort. Behind the screen sits an objectively complex state architecture (Pro Santé Connect, FranceConnect, France Identité, the RPPS national directory) and an audience of a million professionals with no reason to know any of it. The design question: make the journey traversable without ever explaining it head-on.

The decisions

Guiding without explaining the State

Round 1 of testing made it plain: the friction was not in the screens, it was in the mental model. Nobody could tell Pro Santé Connect from Pro Santé Identité, or an “activated” e-CPS from a “certified” one; the RPPS, central to the journey, was unknown to most. And the purpose had vanished: nothing in the app said what all of this unlocks. One participant summed it up better than we could: “It’s as if I’d driven 20 km to Disneyland and stopped at the gate.” The choice: never explain the architecture, get people through it. Internal terminology (“national / local service”) was removed, every action carries its purpose in one sentence (“Certifying your e-CPS will give you access to medical imaging services”), and the point of the journey stays visible at every step.

Taking the 3.4, fixing, measuring again

Round 1 (January 2026, testing run by the ANS). 9 participants on an interactive prototype, two scenarios: account creation, then coming back to the app. Verdict: 3.4 out of 5. The frictions were precise and all fixable. The identifiers screen bred anxiety, with unexplained RPPS duplicates. Certification was too fast to be credible: one tap, no visual feedback, instant doubt. And an “add an identifier” button was read as a password manager.

The fixes, arbitrated then built into the screens. A redesigned identifiers screen (link to the health directory, duplicates explained, reversibility reassured). A certification micro-animation to materialise that something is happening. A confirmation screen and a short post-signup tutorial. Manual RPPS entry. France Identité put forward, with an explicit way out.

Round 2 (February 2026). 13 radiographers, in person across three healthcare facilities, on the hardest path: a professional missing from the RPPS directory. Result: 4.3 out of 5.

One of the fixes, in detail: the identifiers screen, before / after. Left (round 1): the aggressive error on arrival and the "national / local" jargon. Right (round 2): the anxiety defused, every identifier explained and qualified, the link to the health directory. Demo data: the professional profile is fictional, the facilities are public hospitals shown as examples.

"J'exerce dans": one word for a million users

The screen listing a professional’s workplaces was titled “Mes structures” (“My facilities”). The possessive was wrong: you do not own the hospital you practice in. “Structures d’exercice” (“practice facilities”) was accurate but cold and jargon-heavy. The keeper: “J’exerce dans” (“I practice at”). Simple, active, descriptive of the actual relationship, with the “Add a practice facility” CTA carrying the definition. On a state service aimed at a million professionals, this kind of call is not cosmetic: every badly-chosen word becomes a ticket to the support desk.

measured satisfaction
3.4 → 4.3 / 5
testing rounds
2
participants overall
22
User tests on interactive prototype, January and February 2026. Round 2 in person, across three healthcare facilities.

The rest of the arc: the ANS × DSFR Design System and then Ma Certif’ Pro Santé.

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