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Benjamin GuilleminBG

Benjamin Guillemin

Fullstack Web & Mobile Developer

€500/day
Bordeaux, FR
3-7 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Benjamin

Fullstack developer, 4 years of experience (internship + open source), specializing in React, Next.js, TypeScript, Node.js (NestJS / Fastify / Express) and React Native with Expo.

I can be involved in:
  • Development of web and mobile applications, from MVP to production product
  • Agency subcontracting on React / Next / Node / React Native
  • Technical overhauls and migrations (strict TypeScript, hexagonal architecture, Docker)
  • Team reinforcement: dev + code review — I have reviewed several hundred merge requests on Pokémon Workshop (open source project, 65+ contributors)
What I value: maintainable, clear, documented code for those who will come after me. Technical excellence that goes hand in hand with sharing — a habit formed in the open source community.
  • French

    Native or bilingual

  • English

    Fluent

Remote only
Primarily works remotely

Experience

  • Agence Buzz Bordeaux CDI
    Full Stack Developer
    January 2024 - February 2026 (2 years and 1 month)
    Bordeaux, France
    Introduction of mobile development (Expo / React Native) for Android and iOS, a skill absent from the agency before my arrival.
    Implementation of Node.js and React to replace the historical PHP stack, modernizing development processes.
    Development of websites and applications with integration of custom back offices.
    Dockerization of the local PHP environment and automated deployment via SSH on o2switch.
    Implementation and prioritization of the backlog
    React.js Expo Docker Gitlab Node.js
  • Pokémon Workshop Écosystème
    Core Contributor & Community Lead
    VIDEO GAMES AND ANIMATION
    November 2022 - April 2026 (3 years and 5 months)
    First non-staff contributor to the Ruby game engine (PokémonSDK) with cross-functional contributions: combat, visual rendering, UI, effects.
    Contributor to the React/Electron desktop editor (Pokémon Studio) with features, UX, and bug fixes.
    Review of the majority of merge requests, community moderation, and support for new contributors.
    Maintainer of the official documentation (Docusaurus)
    Ruby Typescript Electron Gitlab CI/CD Agile Project Management (Scrum / Kanban)
  • La Maison BSG
    Lead Developer
    E-COMMERCE
    February 2026 - March 2026 (1 month)
    Bordeaux, France
    Artisanal E-commerce: API, website, and mobile application
    Project built from scratch in a monorepo: Fastify API, Next.js website, Expo mobile app, Stripe payment, biometric authentication, admin dashboard with audit
    Next.js Fastify Prisma Expo Stripe

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