Sanofi · 2023 - Mid-2026 · CX Product Designer
Designing data & AI platforms at Sanofi
Prism Platform lets Sanofi's marketing teams measure channel performance, make budget trade-offs and simulate scenarios. The platform now runs in more than 80 countries.
We built it as a team, starting from a blank page. I was the Product Designer, working alongside the Product Owner, data scientists and developers. I then joined the Elements design system team to contribute to its Charts Library, used by more than 20 internal products.
Role
CX Product Designer
Scope
Prism Platform (Marketing Mix Modeling, AI), Design System Elements
Platforms
Web desktop
Tools
Figma, tokens & components
First part of the mission
Prism Platform - Marketing Mix Modeling
April 2023 - December 2025 · 2 years 9 months
Prism is an internal Marketing Mix Modeling platform, a CEO-sponsored project. We started from a blank page, and I owned the design end to end. Marketing teams use it to measure channel performance, make budget trade-offs and simulate scenarios.
All of it was done in close, active collaboration with the project's Product Owner. There was a lot of back-and-forth with the developers and business teams to make hard-to-read data easy to read.
Discovery
Workshops with data scientists and brand managers, user journeys.
Dashboards & Data Viz
ROI curves, waterfall charts, heatmaps, scenario planning.
AI Explainability
Confidence patterns, certainty levels, model limitations.
Second part of the mission
Elements Design System
January 2026 - September 2026 · 8 months
I joined the team behind Sanofi's global design system and worked mostly on what had to hold up across every product. With the other designers, we went product by product to see which patterns kept coming back and what was worth standardizing.
For the Charts Library, I worked with the design and engineering teams on guidelines, components, accessibility rules and reusable patterns.
Charts Library
50+ components: bar, line, scatter, sankey, treemap, heatmap.
Research & Patterns
Cross-product research, UX standardization, accessibility.
Governance
RFCs, reviews, documentation, team enablement.
Client feedback
Jesse
"Romain is a Product Designer deeply dedicated to his craft, with a natural ability to build strong collaboration across design, engineering, technology, and business. He's been a true asset to anyone looking to build well-rounded, holistic products."
Source: LinkedIn recommendation →
