Product Builder

Useful products.
The rest is noise.

From strategy to build, augmented by AI. When everything tends to look the same, product is what will make the difference.

See the drops My CV (PDF)

The 30-second version

  1. Product Designer & AI Builder at Yeita: launched and runs the AI circle, around fifteen people coached.
  2. Demanding fields: banking, insurance, research, e-mobility, circular economy.
  3. Product decisions: impact mapping and quarterly roadmap with the PM at Citeo, PI Planning at BNP Paribas, trade-offs settled with user data.
  4. Results: 2 days saved per release at Citeo, validation time halved at AXA, Stellar rolled out across a dozen BNP Paribas products.
  5. Open to a Product Builder role.
15 min in my calendar ↗ My CV (PDF)

And for what I can't do: the anti-CV →

Drops

Product, data & AI · Citeo

Product, data & AI · Citeo

SKU PROJ-001 · Colorway: Circular economy

A product team that had stopped pulling in the same direction. Shared design system, written decisions, continuous user feedback: 2 days saved per release.

View the drop →
How I build: FRIDA

How I build · Manifesto

SKU PROJ-008 · Colorway: Manifesto

FRIDA, a method in progress to go from a pain point to a product people use. Work in progress, published with what doesn't work yet.

View the drop →
Yeita · Ops & AI

Yeita · Ops & AI

SKU PROJ-007 · Colorway: AI

Yeita treated as a client: around fifteen people trained on AI, then products put in the team's hands, including an online design system that made marketing self-sufficient.

View the drop →
Clearing · Gireve

Clearing · Gireve

SKU PROJ-003 · Colorway: E-mobility

First designer at Gireve. Three months to lay the foundations of Clearing and the design system, then hand them over to a twelve-month project.

View the drop →
Retail Digital Booster · BNP Paribas

Retail Digital Booster · BNP Paribas

SKU PROJ-006 · Colorway: Banking

Three years of Open Banking across 5 group entities. Stellar co-created with the devs, across a dozen products. Joined as a UX designer, left as a product manager.

View the drop →
KYC · AXA France

KYC · AXA France

SKU PROJ-005 · Colorway: Insurance

10 million files, a regulatory reform. OCR in the journey: validation twice as fast, two documents out of three approved on the first pass.

View the drop →
Espace Territoires · Citeo

Espace Territoires · Citeo

SKU PROJ-002 · Colorway: Circular economy

Every declaration was paid for twice: by the user, then by the back-office. 30 to 50% time saved on some declarations, and the equivalent of one and a half full-time roles freed up each year on contract validation.

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Digital twins · CEA

Digital twins · CEA

SKU PROJ-004 · Colorway: Research

A research team without a shared language. A simple design system, adopted down to beginners, and two designers coached.

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FRIDA · Building in the age of AI

Five questions to go from a pain point to a product people actually use: Friction, Research, Imagine, Double review, Adoption. Each step has its question, its deliverable and its AI assist, and it all ends with one simple rule: Kill or Keep. Article coming soon.

Discover FRIDA →

They trusted me

TF1Canal+ChanelBMWBNP ParibasAXACEAGireveCiteoYeitaShaka TF1Canal+ChanelBMWBNP ParibasAXACEAGireveCiteoYeitaShaka

Me, for real

Portrait of Matteo

Digital work has always appealed to me because you never do just one thing. My ground is product, with a strong design hat.

Mission after mission, I've landed in complex environments: banking, insurance, research, e-mobility, circular economy. Each time, there was a business to understand before drawing anything, and teams that talked too little. I bring marketing, PM, dev and data around the same table, spot the tensions, and when a call has to be made, I let user data decide.

That reflex of reaching out to others is one I practised a lot while travelling. I spent a year in Asia, backpacking, exploring and volunteering with animal protection organisations. You quickly get used to chaos and uncertainty, and you learn to go towards people when you don't understand.

AI is a good executor. With centralised, accessible data, it runs tasks in parallel and delivers more value. It doesn't look at the experience as a whole: someone always has to supervise.

The rest of the time, I keep moving. Diving, hiking, cycling: whenever I can, I head out into nature.

2
days saved per release at Citeo
10
million customer files on AXA's KYC journey
12
products on Stellar, the design system co-created at BNP Paribas

Now

  • Oct 2026 Back at Yeita after a year in Asia. Running the AI circle: team upskilling and an AI offer to build by early 2027.
  • Oct 2026 An agent harness that goes from an insight to Figma mockups. Shown in a client demo, not yet in production.
My CV (PDF) The anti-CV

Failures

What didn't work, and what changed since.

Taking the brief at face value

On a new assignment, discovery calibrated on decision-makers. The real users were in the sales teams.

Since then: stakeholders mapped by day two, insights taken at the source, on every mission.

A one-way design system

Remote developers were rebuilding the designs under different names. Double work, invisible in the rituals.

Since then: components named the way the code does, Storybook as the reference between design and dev.

Repeating instead of writing

The same trade-offs re-explained team after team. Sprints lost re-validating what was settled.

Since then: every decision is written down, and every team can raise a flag early.

Want the full version of my limits?

Read the anti-CV →

The latest

Published articles and guides.

yeita.fr Use case · FR

Citeo : quand l'équipe produit s'aligne grâce au design et à la data

Read the use case ↗
yeita.fr Lexicon · FR

IA Made in Yeita : le lexique de l'IA

Browse the lexicon ↗
yeita.fr Guide · FR

Faire une discovery express grâce à l'IA

Follow the guide ↗

FAQ

Are you available?

Yes. Currently at Yeita, where I run the AI circle, I'm looking for a Product Builder role, with topics to own and impact to measure. Shall we talk for 15 minutes?

Do you do product or design?

Both. Design, and product decisions: impact mapping and roadmap with the PM at Citeo, PI Planning at BNP Paribas, trade-offs with stakeholders at Gireve. Whenever possible, user data settles it.

Do you code?

With coding agents, yes: this site, my design system, demonstrators. But development is a craft, and I'm not an engineer. I try to understand how it works, to speak the same language as the devs and collaborate well with them.

Do you make slides?

As few as possible. A clickable prototype says more than a 40-page deck.

Have you managed people?

Not directly. I launched and run Yeita's AI circle, with around fifteen people coached one-to-one and in workshops. At CEA, I upskilled two designers. Moving from mentor to lead is the next step.

What's your take on AI?

It executes well, as long as it has access to centralised data. It goes into a product when it fixes a usage problem. Otherwise, saying so is part of the job.

Did you build this site alone?

With Claude Code. If you design products with AI, you might as well build your own that way. Details on the Under the hood page.

Let's talk?

A project, a question, an idea to challenge: write to me, I reply.

hello@matteoeponville.fr LinkedIn Calendly
This site's changelog

* Just kidding, I'm better organized than that.

You made it to the very bottom. Respect. One thing nobody guesses here: I know Bad Bunny's Baile Inolvidable by heart. Yes, all of it.