01 · Artificial intelligence
AI & agents
AI in production, not in a demo.
LLM integration, agents, RAG, OCR, automation and local models, from idea to production.
Agents · RAG · OCR · Automation · Local models
AI and agent integrationSébastien Fontaine — freelance senior developer, applied AI, backend and infrastructure
Design. Build. Ship to production.
Applications, infrastructure and artificial intelligence.
I help companies bring AI into their products and processes, from prototype to production. 15 years of web, backend, cloud and DevOps development. Based in the Paris region, working remotely.
- 15 years
- of development (since 2011)
- Freelance
- since 2018
- 10+ years
- working with a 5-star Relais & Châteaux hotel
- 70,000+
- users for an open-source Chrome extension (Chrome Web Store, January 2024)
01 · Expertise
02 · Backend & infrastructure
Laravel, backend & DevOps
15 years building applications that have to hold up.
Laravel applications and APIs, AWS, Docker, GitLab CI, SQL tuning, production performance and reliability.
Laravel · AWS · PostgreSQL · Docker · GitLab CI · Observability
Laravel, backend and DevOps03 · Search & GEO
SEO & GEO
Be found on Google. Be understood by AI.
Get recommended by ChatGPT, Gemini or Claude. A full audit and implementation for SMEs, hotels and restaurants.
Technical SEO · GEO · Structured data · Search Console · Content
SEO and GEO audit02 · Selected work
All workAI & development · Personal project
Galactic Reigns
Migrating an entire backend with AI agents
A Laravel → NestJS migration by a chain of specialised agents, with tests, adversarial review and the old code as an oracle.
« Mechanics beat prompts. »
SEO & GEO
Blue Margouillat
How does a 5-star hotel become understandable to AI?
10+ years of hosting and maintenance, then a full SEO & GEO audit of a Relais & Châteaux hotel's website.
Artificial intelligence
AI agents for a development team
Agents that work alongside developers, every day
Fixing production errors, code review, performance investigation: AI agents in production inside a product team.
03 · My studio
Small studio, useful software.
FuryBee is my independent studio: tools that run in the browser, article libraries, games, apps and developer products. I design, build and host them myself, in France.
- 21
- live services
- 230+
- technical articles
- 47
- games in the arcade
- 1
- server, in Paris
-
Learn
Articles and news
AI · Code · Infra · Security · News
-
Create
Browser tools
Tools · Image · Audio · Video
-
Play
Games
Arcade · BeeBee Kids · Galactic Reigns
-
Build
For developers
Themes · Packages · Web Store · Dictea
-
Apps
Account-based apps
Voice · FinBoard · profyl.it · BeeBee
04 · Why work with me
01
A developer first, not a slide-deck consultant.
I don't make recommendations I couldn't implement myself: I deliver code, pipelines and production releases.
02
AI in production, not in a demo.
I build agents that run every day inside a product team: tests, sandboxes, monitoring, costs.
03
Production is the culture.
Monitoring, SQL performance, scaling, incidents: I know what happens to an application after it goes live.
05 · Frequently asked questions
Do you work remotely?
Yes. I'm based in the Paris region (Île-de-France) and work remotely, in English or French.
How does an engagement work?
A first call to understand the need, a written proposal (fixed price or time and materials), then regular deliveries. I invoice as a French sole trader.
What are your rates?
From €750 per day for development and DevOps, €900 per day for AI integration, and €1,500 for a full SEO & GEO audit, deducted from the implementation (excl. VAT). A first automated audit is free online.
Can you take over an existing application?
Yes, that's a large part of my work: a code and infrastructure review, then improvements without rewriting everything.
06 · Contact
Got a project in mind?
Describe what you need in a few lines: I'll get back to you with a first analysis and next steps.
Or email me directly : hello@sebastienfontaine.me