Freelancer profile translated to English.
Back to original languageAbout Grégoire
I am a multi-skilled builder who helps startups transform an idea into a running system. A graduate of ENSTA Paris, HEC, and UC Berkeley, I combine technical rigor, speed of execution, and business understanding.
My playground:
- AI agents and AI in production
- Fast and solid full-stack development
- Voice AI (LiveKit, Vapi, Deepgram, OpenAI, etc.)
- B2C acquisition and growth tech
- Product and business workflow automation
I founded Prepstr, a company where I built the product, the technical structure, and several automation systems. I also developed a real product and business insight alongside technical execution.
Some benchmarks:
- 10,000+ users in the last 12 months
- 2+ million TikTok views in the last 3 months
- ~€20k in revenue generated 100% organically from TikTok in recent months
- Winner of the international hackathon EF x Lovable (May 2025)
- Winner of the Hugging Face x Zama hackathon (September 2024)
I work very well with early-stage teams that need someone fast, autonomous, and capable of bridging product, tech, and growth. I am particularly relevant for one-off or short-term missions.
French
Native or bilingual
English
Fluent
Can work on-site
Paris (up to 50km)
Experience
- PrepstrFounderEDUCATION AND E-LEARNINGOctober 2025 - Today (8 months)AI platform for preparing for TOEIC/TOEFL, with possible support from certified teachers.- Product development- Automation systems / autonomous agents- Organic B2C acquisition via TikTok and SEO: +1M views/month on TikTok via automated creatives across multiple accounts- ~€20k revenue
- WAVESTONEConsultantApril 2023 - August 2023 (4 months)Paris, France• Data collection, visualization, analysis, and communication within a transformation project involving 100 people for a major player in the French railway industry; planning and leading decision-making and steering committees.• Conducted an internal study on the carbon footprint and decarbonization challenges for major retail players, as well as on technological tools and solutions for achieving carbon neutrality.
- Pépite Start'up Ile-De-FranceStudent EntrepreneurSeptember 2022 - April 2023 (7 months)Paris, FranceDesigned a social network connecting users in proximity via Bluetooth:● Conducted a consumer study based on about a hundred participants● Legal study on data processing (GDPR compliance, drafting of Terms of Service)● Developed the solution (prototyping and design, UI creation); multi-channel communication strategy (landing page, social media, events); pitch competitions (Paris-Saclay, CentraleSupélec, Incuballiance)Designed a mathematics training for parents https://guide-mathematiques.super.site/● Conducted about fifteen interviews to clarify needs● Designed the value proposition and developed the solution (solution prototyping and design, creation of the online guide in 2 parts: technical video modules and methodology); developed a communication strategy.
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Education
- Postgraduate Entrepreneurship TrackUniversity of California, Berkeley2024L2L - Silicon Valley Innovation and Entrepreneurship Program
- Master SpécialiséHEC Paris2024Entrepreneurship (X-HEC program)