Sébastien F., SaaS Developer | NestJS, React, React Native

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Description

Full-stack developer specializing in SaaS applications and MVPs.

I assist startups and entrepreneurs in designing, developing, and rapidly launching their web and mobile products.

- React-based web applications

- High-performance NestJS APIs

- Mobile application development with React Native

- Scalable architecture for SaaS

I participate in:

- MVP creation

- feature additions - technical review - performance improvements

Main technologies: NestJS, React, React Native, Mariadb, MongoDB, TypeScript

Available for freelance missions.

Industry field of expertise

Languages

French
Native or bilingual

Workplace preferences

Remote only

Primarily works remotely

Nod-i
Lead Dev
February 2022 - December 2025 (3 years and 10 months)
CTO and Backend NestJS developer in Web 3.
During this period, I managed 4 developers and designed the overall project architecture (Stack React MUI, NestJS, Docker etc..).
I also developed a multi-currency Crypto wallet and several backend parts of the project.
NestJs backend-service-development Typescript
Lumy Home
Creation of a Zigbee home automation solution
July 2025 - September 2025 (2 months)
Creation of the Lumy-Home home automation solution with Zigbee 3.0 gateway.
Creation of the backend in NestJS, zigbee2mqtt. Frontend in React. Database in SQLite. Docker integration

Focused on novice users, it was designed around simplicity.
NestJs external-api-integration Typescript
Projet personnel
Android / iOS application developer with React Native and Skia
January 2026 - Today (5 months)
Since the beginning of 2026, I have been developing mobile games with React Native and Skia for the 2D/3D engine.
I have developed the games One Mistake and Space Fox, which are a logic game and a 3D rail shooter, respectively.
For the game Space Fox, development of the PvP server in NestJS with websocket
NestJs React Native backend-service-development

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