Full-stack developer.
I build AI systems, from scratch, with AI.

Open to new opportunities

Good software starts from what its users need, then the architecture and infrastructure that serve it. AI runs through both: MCP servers, agents, and the harness that makes them reliable. Close to five years in startups.

Pierre Hervelin, full-stack developer

Scroll to see the workLatest work

Work

3 of 6 projects

  1. Fruggr

    01 / 03AI governance, accessibility, ecodesign2025–now

    Three modules of a European ESG suite: AI Governance, whose foundations I laid, Accessibility and Ecodesign.

    Digital4Better · TypeScript, React, NestJS, MCP, Azure

    Open the case study

  2. CarbonScore

    02 / 03SaaS2021–now

    Shows employees the carbon footprint of their digital workplace. Close to four years on it, the last ones as lead.

    TechupClimate, then Digital4Better · TypeScript, Vue, NestJS, PostgreSQL

    Open the case study

  3. Abacus

    03 / 03Web app and MCP server2026

    A self-hosted personal finance app you talk to: you declare what happened, an AI agent records it through MCP.

    Personal product · Next.js, PostgreSQL, MCP

    Open the case study
All six projects

About

Close to five years building SaaS products, in climate tech and the ESG impact of digital services. The work starts from what users need; the architecture and infrastructure follow, and that is where I keep learning. AI runs through both, and growing an AI system that keeps improving is what I enjoy most. The AI writes most of the code; what makes it good is its harness, the instructions, data, tests and language around it, and that is what I build.

Experience, skills and side projects
  • Full stackReact, NestJS, GraphQL, PostgreSQL, Kubernetes, Azure
  • AI programmingThe harness that makes AI code well: specs, instructions, data, tests. Agentic coding with Claude Code, several tasks in parallel.
  • AI systemsMCP servers, agents and validation harnesses in production. AI usage telemetry with OpenTelemetry.

Hiring? Let’s talk.

Long freelance engagements are welcome too.

Get in touch