Freelancer profile translated to English.
Back to original languageAbout Jean-Charles
Node.js/TypeScript specialist with 15+ years of experience, including 12 years as CTO or technical lead for hyper-growth startups.
I work on ambitious projects — architecture, refactoring, or greenfield — with a strong focus on code quality and delivery speed.
I systematically integrate AI tools (Cursor, LLMs) into my workflow to halve development time without sacrificing maintainability.
Goal: a product that moves fast, cleanly, and without hidden debt.
French
Native or bilingual
English
Fluent
Remote only
Primarily works remotely
Experience
- CollectifmywayFullstack Developer (Next.js / NestJS)TRAVEL AND TOURISMApril 2025 - Today (1 year and 2 months)Lille, France
Context:
Project with strong evolution and a very difficult first version for beginners to take over.Missions:
- Evolution of V1 developed in Next.js with a very functional logic
- Refactoring of the architecture towards a NestJS + Next.js stack
- Simplification and improvement of code readability
- Design of a more maintainable and scalable technical foundation
Achievements / Impact:
- Significant improvement in project maintainability
- Implementation of a clearer and more accessible architecture for the team
- Acceleration of development thanks to better code organization
- TellowFullstack Developer (React Native / Supabase)HEALTH AND WELLNESSApril 2025 - August 2025 (4 months)Lille, France
Missions:
- Update and maintenance of the React Native mobile application
- Integration and management of the backend via Supabase (authentication, database, API)
- Performance improvement and bug fixing
- Implementation of new product features
Achievements / Impact:
- Application stabilization and improvement of user experience
- Optimization of data flows between frontend and backend
- Continuous delivery of new features
- Coco cookingCTO - Backend DeveloperJanuary 2023 - April 2025 (2 years and 3 months)
Missions:
- Development and management of the platform's backend (architecture, API, data pipelines)
- Management of scalability challenges related to international traffic peaks
- Implementation of robust infrastructures to support large data volumes
- Technical choices, roadmap support, and product evolution
Achievements / Impact:
- Backend stabilization and optimization to handle high loads
- Significant improvement in performance and response time
- Structuring of a data architecture capable of processing large volumes continuously
- Acceleration of product development thanks to a reliable and scalable technical foundation
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Education
- Management Information Technology BTSEfficom lille2007