Freelancer profile translated to English.
Back to original languageAbout Sébastien
Senior **fullstack developer with 17 years of experience**, specializing in designing **complex SaaS platforms and business software**, with practical experience in **AI-assisted development**.
I am involved in the entire development cycle: **technical architecture, backend and frontend development, deployment, and performance optimization**.
My core expertise lies inAngular, NestJS, and TypeScripttechnologies, with extensive experience in building technically complex web platforms.
I integrate AI as a real acceleration lever in my projects: designing LLM pipelines, code generation, rapid prototyping, and vibe coding on Angular/NestJS stacks.
I have worked formajor clients (Airbus, Air France, Thales)as well as startups and SMEs on projects such as:
- SaaS platforms
- Custom business tools
- Scoring and data analysis systems
- Web and mobile applications
I specialize in:
- SaaS platform architecture
- Fullstack Angular / NestJS development
- API and microservices design
- AI integration and LLM pipelines (Mistral, Claude, ChatGPT)
- AI-assisted development: vibe coding, code generation, UX prototyping with Base44 and Lovable
- Business process automation
Main Stack: Angular · NestJS · TypeScript · MongoDB · PrimeNG · TailwindCSS · AWS · Docker · Claude Code · Mistral · ChatGPT
French
Native or bilingual
English
Fluent
Can work on-site
Toulouse (up to 30km)
Experience
- Infinite StudioAI-Assisted Development / SAAS Concélio ExpertSOFTWARE PUBLISHINGFebruary 2026 - Today (4 months)Experimentation with a 100% AI-assisted development approach, aiming to generate ~80% of the code for a complete business application without initial manual development.
- Implementation of a vibe coding workflow with Claude Code and ChatGPT (Open Code)
- Use of Base44 and Lovable for generating and exploring mockups
- Training and customization of prompts on our technical stack (Angular, NestJS, Tailwind, PrimeNG, MongoDB) and our internal ISF libraries
- Validation of the AI approach as a development acceleration lever on a real project
- Vitalis GroupFullstack Angular / NestJS ExpertCONSULTING AND AUDITSMay 2025 - Today (1 year and 1 month)Toulouse, FranceDevelopment of aSaaS mystery shopping management platformto centralize business processes and replace the Sphinx tool.
- Design of an advanced questionnaire editor (pages, question groups, dynamic components)
- Development of a rules engine for conditional question display
- Implementation of a constraint and theme configuration system
- Implementation of a modification history system
- Creation of a questionnaire preview and execution module
- Use of Base44 and Lovable for AI-generated mockup design and exploration
Vibe coding with Claude Code and ChatGPT (Open Code) to accelerate interface development - Mazzon&tCoFullstack Angular / NestJS ExpertENVIRONMENTALDecember 2025 - March 2026 (3 months)Toulouse, FranceDesign of acarbon credit marketplace platformallowing companies to buy and sell certified carbon offset projects.
- Functional and regulatory feasibility study
- Technical architecture design
- Stripe integration for marketplace transaction management
- Development of the project search and consultation system
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Education
- Bachelor's degree, Computer ScienceCNAM2013Licence, Informatique
- 3D Designer - VFXARIES Toulouse2009Concepteur 3D - VFX