Sanofi — Making generative AI useful and trustworthy in healthcare

Technology
Younited — A credit application journey people actually finish

Technology
Chugai Pharmaceutical — Collecting clinical trial data without errors or fatigue

Technology

Daniel César Vieira · Now booking for Jan 2027

I help product teams ship AI tools people actually use, and that pay off

Customer Experience & Strategy · Making AI useful and trusted in healthcare and finance · 20+ years · Sanofi

Book a 30-min call View case studies

I help healthtech and fintech teams make complex data and AI easier to understand and use. I turn user research and business goals into clear products that improve adoption, conversion and retention.

With 20+ years of experience, I’ve worked on an AI platform for Sanofi and partnered with Sony Music, Younited, Leetchi and Chugai Pharmaceutical. Based in Paris, I work with international teams.

Book a 30-min call

How I turn complexity into measurable product impact.

AI-Driven Experience Strategy

I build and lead AI tools that act as scientific partners, with explainable recommendations, human-in-the-loop workflows and guided reasoning.

Research & Data-Driven Decisions

Qualitative and quantitative research, A/B testing and usability scoring validate every hypothesis before it ships.

Conversion & Retention

I optimize journeys and key metrics in fintech and healthtech, from instant credit to investment and money collection.

Regulated Environments

Experience in pharma and finance, with GxP, HIPAA and accessibility (AA) requirements built in from the start.

Freelance missions for healthtech and fintech teams: AI-driven CX, CX and product strategy for enterprise and consumer apps, UX research and design systems. I work in English, French, Portuguese and Japanese, and I’ve partnered with product, engineering and science teams in Paris, Tokyo and the US.

Book a 30-min call

Also on Malt · LinkedIn · Toptal

Voices of Appreciation

“Excellent work from Daniel! I can only warmly recommend his services: rigour, attentiveness and professionalism set the pace of our collaboration. We will not hesitate to call on him again!”

Nada — VERA (via Malt, 5/5) · translated from French
“Very relevant experience-based feedback that helped us move forward and improve the experience! Thank you, Daniel!”

Margot — Deep Belief (via Malt, 5/5) · translated from French
“Daniel is creative and proactive in putting forward proposals in his work”

Richard Bliah, SIAMA (architecture), Tokyo · translated from French

Sanofi — Making generative AI useful and trustworthy in healthcare

Younited — A credit application journey people actually finish

Chugai Pharmaceutical — Collecting clinical trial data without errors or fatigue

Sony Music — A web player validated in the usability lab

ilycoach — From coach booking to a B2B platform

Face the Robot Challenge (Honda Research Institute) — Giving an AI a face people can trust

Got it: Learning platform

Choose a time for a 30-minute call.

Sanofi — Making generative AI useful and trustworthy in healthcare

Younited — A credit application journey people actually finish

Chugai Pharmaceutical — Collecting clinical trial data without errors or fatigue

I help product teams ship AI tools people actually use, and that pay off

Key Expertise

AI-Driven Experience Strategy

Research & Data-Driven Decisions

Conversion & Retention

Regulated Environments

Working With Me

Voices of Appreciation

Recent Projects

Sanofi — Making generative AI useful and trustworthy in healthcare

Younited — A credit application journey people actually finish

Chugai Pharmaceutical — Collecting clinical trial data without errors or fatigue

Sony Music — A web player validated in the usability lab

ilycoach — From coach booking to a B2B platform

Face the Robot Challenge (Honda Research Institute) — Giving an AI a face people can trust

Got it: Learning platform

Ready to talk about your next product challenge?