Nicolas Fez

I develop full-stack web and mobile products, and for some time now I've been integrating AI into them: agents, LLMs, and MCMs.

Full-stack developer on React, Next.js, React Native, Node.js, and TypeScript, I take products from idea or mockup to production.

I rely on agentic workflows like Claude Code to deliver quickly, while maintaining clean and maintainable code.

What I can help you with:

⚛️ Web applications, SaaS, dashboards, and internal tools (React / Next.js)

📱 iOS & Android applications (React Native / Expo)

🤖 AI Agents, LLM integrations, and MCM servers (Claude, OpenAI, Gemini)

⚙️ Node.js APIs, authentication, payments, third-party integrations

🧱 Taking over existing projects: stabilization, refactoring, returning to production

Why me?

I know the stack inside out, from low-level to system architecture: clean architecture, monoliths and microservices, design patterns.

I work in Agile, with code review, unit and end-to-end tests, and CI/CD by default.

I also develop my own products, which keeps me very close to what delivering a product really entails. The latest one, Nextrip (an online travel app on the Play Store and App Store), I built and published alone, from GDPR compliance to payments and store submission.

On the client side, I've delivered products in production with real users.

For a French startup, I built the marketplace connecting Parisian producers and restaurateurs, now used by over 3,000 users.

And at Valeo, I developed AssistXR, an AI assistant for connected vehicles (real-time sensor data, cloud, AI), unveiled at CES 2025 in Las Vegas and broadcast live on national channels worldwide.

Have a product to launch, scale, or save? Let's take action.