Sébastien Fontaine

Senior full-stack & AI developer

A developer since 2011, I design, build and run web applications, from backend to infrastructure, and now integrate LLMs and AI agents in production. 15 years of experience, with a strong focus on performance, observability and automation.

Experience

  1. HeyTeam Current

    Since Oct. 2023

    Senior Web Developer & AI · Paris

    • AI assistants for drafting emails, creating surveys and organising events
    • Conversational agent backed by a knowledge base and the application's API
    • Continuous improvement of features, based on user feedback and performance analysis

  2. Freelance (sole trader) Current

    Since Aug. 2018

    Freelance senior developer

    • 5-star Relais & Châteaux hotel (Blue Margouillat): hosting, maintenance and development for 10+ years, SEO & GEO audit in 2026
    • Custom applications and websites, AI integration, SEO & GEO audits

  3. GlobalExam

    2019 — 2023

    Tech Lead · Paris

    • B2B / B2C administration platform
    • Learning platforms: language certifications, Business English, general English
    • Database management

  4. Papang Production

    2014 — 2018

    Founder and web developer · Montpellier

    • Running the company, building and maintaining websites

  5. logiCells

    2011 — 2016

    Developer · Réunion Island

    • Application and web development, stabilising and evolving the in-house engine

Personal projects

  • Galactic Reigns galactic-reigns.com

    Real-time space strategy MMO. Backend migrated from Laravel to NestJS by a chain of AI agents (24 business domains).

  • FuryBee furybee.org

    Self-hosted open-source platform: 35 containers, Traefik, Cloudflare, Prometheus, Grafana, Loki.

  • Tab Modifier github.com/furybee

    Open-source Chrome extension: 70,000+ users (January 2024), 697 GitHub stars.

  • Dictea dictea.furybee.org

    Open-source voice dictation in Rust: transcription and LLM text clean-up.