Freelancer profile translated to English.

Description

I build software that generates revenue and run the infrastructure behind it. Full-Stack Developer and AI Engineer with hands-on experience from the first line of code to the production server. No buzzwords, pragmatic solutions with measurable impact.

Specialization: Agentic AI and Multi-Agent Systems, RAG and LLM Integration (Claude, Gemini, OpenAI), Prompt Engineering. I bring AI pipelines into production, not into demo mode.

What I take on: complete web apps and SaaS (Django, FastAPI, React), AI and automation pipelines, API integrations, as well as server setup, deployment, and operation (Docker, Traefik, Linux).

References:

- OptiEstate: B2B SaaS from scratch to production with multi-agent lead pipeline and AI image processing. Django, PostgreSQL, React, Stripe, own Linux VPS.

- Parametric CAD engine for a client in the shoe industry: own geometry kernel (build123d/OpenCascade) that calculates manufacturable sole geometry from real factory data, including STEP/DXF export. Performance accelerated 8x in production.

- Planète Kino Kabaret World (HamburgerKino e.V.): multilingual platform with interactive 3D globe, editorial CMS, and AI pipelines (Gemini translation, Vision OCR). Self-hosted, GDPR compliant.

- redpinata GmbH: 16 years of management and technical leadership of an EU-funded film production, including two EU innovation projects: a mobile IRL live broadcast system (Cellular Bonding plus Starlink, SRT/RTMP) and a live translation system.

- E-Commerce: Etsy shop with 270+ listings, fully automated via API, plus marketing (Meta/Google Ads, Pinterest).

Whether I'm a good fit for your project, you can check it live yourself: maximebillon.com/fit matches your request against my real projects, honestly including the gaps.

From code to server, solo from concept to operation.

Industry field of expertise

Languages

German
Native or bilingual
French
Conversational
English
Fluent

Workplace preferences

Can work on-site

Hamburg (up to 50km), Münster (up to 50km)

HamburgerKino e.V.
Solo Full-Stack & Agentic-AI Developer
CULTURE
May 2026 - Today (3 months)
Hamburg, Germany
Multilingual, productive web platform for an international cinema cabaret festival network. We developed the idea together with the association, and I was solely responsible for the technical implementation and operation.

- Interactive 3D globe (d3.geoOrthographic, TopoJSON), deliberately without map SaaS for restrictive CSP and GDPR.
- Full-stack backend: FastAPI plus SQLite (WAL), multi-user editorial CMS with cell/event CRUD, submission review queue, media management, and email invites.
- AI pipelines in production: Google Gemini for translation into 4 languages, festival extraction (forced JSON responseSchema), and vision OCR of film credits.
- Security: PBKDF2, HMAC-signed sessions, double-submit CSRF, upload hardening, rate limiting.
- Production infra single-handedly: uvicorn under hardened systemd, BunkerWeb reverse proxy, AES-256 encrypted off-site backups.
- GDPR-compliant frontend without framework: Vanilla JS, own i18n engine, consent without dark patterns, consistent accessibility.

AI-augmented Workflow
LLM Integration Generative AI Agentic AI Prompt Engineering
OptiEstate
Full-Stack Developer & AI Engineer
REAL ESTATE
January 2026 - Today (7 months)
Hamburg, Germany
Development of a complete SaaS platform for real estate agents. Full-stack development with Django, PostgreSQL, and React. Stripe payment integration, multi-user system with role-based access control, automated dashboards with real-time KPIs.
Server setup and administration: own Linux VPS, Docker containers, Traefik as reverse proxy with automatic SSL certificates. SEO strategy with programmatic city pages, schema markup, Google Ads, and Meta Ads campaigns for lead generation. Integration of AI APIs (Claude, Gemini) for content generation and data analysis. 11 development phases from the first commit to production.
Django Docker PostgreSQL React Python
Selbstständig
E-Commerce Automation & DevOps Engineer
E-COMMERCE
January 2024 - Today (2 years and 7 months)
Hamburg, Germany
Development and operation of automated e-commerce systems. AI-powered image generation with Google Imagen 4 Ultra and Gemini Flash for digital products.

Automated Design Pipeline:HTML templates exported to print-ready formats via Playwright. Custom analytics dashboard for revenue tracking, SEO scoring, and performance monitoring. Data-driven tag optimization with market data and cannibalization detection. Pinterest marketing automation with video pin production.
Server administration on Linux VPS with Docker and Traefik. All processes automated via Python, REST APIs, and cron jobs.
Python Docker AI Integration React PostgreSQL