Freelancer profile translated to English.
Back to original languageAbout Charly
A graduate of 42, I've been doing Full-Stack development for 4 years. Java, TypeScript, Node, Prisma, PostgreSQL (Supabase if needed) on the back-end, React and React Native on the front-end, a solid stack that I master from end to end.
I've spent the last two years specializing in implementing AI in production and architecting LLM systems that need to perform daily. I recently shipped Anesth.ai, a medical SaaS now deployed and under study at the Lille University Hospital: patient result analysis, pathway recommendations, all with the associated constraints: data sovereignty, HDS compliance, and zero tolerance for hallucinations. From prompt engineering to global architecture, including RAG systems with pgvector and orchestrated AI agents.
Besides that, I also build more classic back-ends: auth, Stripe, dashboards, third-party API integrations. And since I work with mobile (React Native / Expo), my APIs are designed from the start for what the front-end will actually do with them.
French
Native or bilingual
English
Fluent
Spanish
Fluent
Remote only
Primarily works remotely
Experience
- dust adventure club
On Malt
Creation of a Stripe deposit tool + website integrationMay 2026 - May 2026Design and development of a credit card deposit management system for a motorcycle rental business, integrated into the organization's website.Implementation of a small Node.js / Fastify back-end with an SQLite database, managing the complete Stripe pre-authorization flow (PaymentIntent with manual capture), full or partial capture in case of damage, and cancellation releasing funds at the end of the rental. Secure admin interface with authentication, allowing the renter to generate a deposit link, track the status of each pre-authorization, and trigger capture or cancellation with one click.Stripe webhook with signature verification and idempotence management, deployment on Railway, integration of the flow from the existing website. Minimalist, secure approach, charged only on deposits actually captured, zero Stripe fees on rentals without damage.Stack: Node.js, TypeScript, Fastify, SQLite, Prisma, Stripe API, Railway - Anesth.aiFull Stack Developer & ArchitectMEDICALNovember 2025 - April 2026 (5 months)Paris, FranceAnesth.ai is a patient pre-operative pathway optimization application, deployed and under study in 2 hospitals. As the sole developer on the project, I designed and developed the entire architecture and product.The core of the project relies on an AI layer capable of interpreting and reformulating natural language into medical terminology, analyzing anonymized patient results, and generating care pathway recommendations. In this context, neither interpretation errors nor data leaks are acceptable.Major technical challenges: optimizing AI analysis on sensitive health data, data sovereignty, HDS and GDPR compliance, and integration into a hospital environment with strict operational and regulatory constraints.
- P&SFull Stack Application DevelopmentSOFTWARE PUBLISHINGNovember 2025 - January 2026 (2 months)Bruxelles, Belgium- Development of a secure REST API with a modular architecture (routes, services, controllers)- Design and implementation of a relational database schema (Users, Wallets, Transactions)- Complete integration of Stripe for payments with webhook management- Development of a cross-platform mobile application (iOS/Android) with Expo- Implementation of a secure JWT authentication system- Management of the complete project lifecycle (design, development, testing)- Configuration of production infrastructure (domain, hosting)
Reviews
S
Sabrina
Fondatrice de Pay&Split - P&S
Several weeks project
-
Reviewed on 1/24/2026
I recommend Charly, the collaboration went very well. He was attentive and adapted the project as the days went by. Very efficient work and deadlines met. I would definitely work with him again on future projects!
Laurent
Directeur - dust adventure club
Reviewed on 5/25/2026
Recommendations
SL
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Education
- Digital Technology Architecture42 Paris2023Réalisations de plusieurs projets de fond dont: > Pong : site web avec chat instantané et base de données pour jouer a Pong en ligne > IRC (Internet Relay Chat) : serveur de chat peer-to-peer, codé en C++. > Minishell : shell fonctionnel pour exécuter des commandes bash, codé en C. > cub3D : jeu "Doomlike" pour explorer les algorithmes de ray-casting, codé en C.
- Cultural Organizations Management - MasterParis Dauphine PSL2021