Sacha Fontaine
Product Builder & Entrepreneur
I design and launch concrete digital products. Website and application creation, digital product launches, custom tools and automations.
With over 5 years of experience as a product builder, autonomous and curious, I’m involved across the entire product lifecycle: from idea to production, with a pragmatic and user-focused approach.
Experiences
AI Product Manager
Qwant
2024 – Present
- •Design and delivery of large-scale AI experiences for a European search engine.
- •Strong constraints around privacy, performance and technical efficiency.
- •AI overviews, AI chat, new search interfaces.
Freelance Product Builder
SMEs & Startups
2019 – Present
- •Helping companies build and evolve digital products.
- •Web applications, SaaS MVPs, internal tools, automations and AI-powered experiences.
- •Fast execution, high autonomy, strong focus on delivered value.
Product Builder
PayFit
2022 – 2024
- •Hybrid role between product management and delivery in a fast-growing SaaS environment.
- •Products related to accounting, reporting, APIs and social declarations.
- •Close collaboration with tech and ops teams to ship quickly.
Product Manager
Altice Media
2020 – 2022
- •Product management for the group’s mobile applications (BFMTV, RMC, BFM Business).
- •Major redesign of the BFMTV app for the French presidential elections.
- •Coordinated design, tech and editorial teams.
Projects
Pacemate — AI Running Coach
Personal project
Freelance — Product & Web Tools
Client work
Beyond work
Running, trail & outdoor
I’m part of an athletics club and train on a daily basis. These disciplines directly influence how I build products: long-term progress, method, consistency, and vision.
Entrepreneurship
I am also the co-founder of a swimwear brand (Mouiller le maillot)born from a concrete need, launched through crowdfunding and grown over several years. A real-world playground for product, marketing and execution.
Let's work together
Have a project, an idea or a product / tech need? Let’s talk.