Freelancer profile translated to English.
Back to original languageAbout Julien
Since 2021, I have been working as a CTO as a Service, supporting startups and SMEs from the idea to the live product: structuring the tech vision, choosing architecture, building teams, and often developing myself.
More recently, I have shifted to AI-driven development. I use AI agents and agentic coding to build software faster, lighter, and smarter. This is not experimentation — this is how I deliver today.
Before that, I founded Phoceis, a digital agency specializing in mobile. In 15 years: from 0 to 40 people, expansion to Shanghai in 2014, exit in 2017 (Ineat group).
Co-founder of GEN AI Builders, the French community of professionals building with generative AI.
French
Native or bilingual
English
Fluent
Can work on-site
Paris (up to 10km), Lille (up to 10km)
Experience
- Ask EkoCTO as a Service - Impact ProjectRETAIL (SMALL BUSINESS)November 2024 - Today (1 year and 7 months)Lille, FranceMission for the launch of the company AskEko, which rewards citizens for eco-responsible actions with cashback: repairing or reselling a product instead of throwing it away, buying second-hand instead of new, donating to charities.Development from scratch of version 0, namely an end-user mobile application (Flutter) and its associated backend (.net). With API integration of several AI components, notably a Vision type LLM.Application launched in Fall 2025, currently being tested by several clients.
- J'ai une place !Co-founder & CTO — Solidarity Carpooling ApplicationTRANSPORTATIONSeptember 2025 - Today (9 months)Paris, FranceCo-founder and CTO of J'ai une place !, a carpooling application designed to promote mutual aid and mobility for residents of rural areas in France. Product design, development of the mobile application in Flutter and the backend in .NET Core. Integration of geolocation, matching between drivers and passengers, and real-time notification functionalities. Social impact project aimed at combating isolation in rural areas.
- MyMagDevelopment of a complete ERP (mobile + back-office + API).RETAIL (LARGE RETAILERS)June 2025 - December 2025 (6 months)Lille, FranceDevelopment of an ERP for an SME operating in the retail sector.Creation of a complete ERP including the administration interface for the management team, and the mobile application for field employees.Some features: mission management, contract management, timesheets, consumables.Integration of an LLM to accelerate mission creation by analyzing customer requests sent by email to the company.Tools developed in Flutter and .NET CoreCICD Code Magic / GitHub Actions
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Education
- EngineerEcole Centrale2000Option Entrepreneur
- Managing InnovationStanford University2017Stanford Center for Professional Development - Managing Innovation