harrolf (Harrolf Hemel) · GitHub
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harrolf/README.md

Harrolf Hemel

CTO, Enterprise / Domain Architect, Leader and 20+ years in tech. Leader and chose to go back hands-on.

Direct, kind, energetic.

What I Build

Current Projects

  • project 1 —
  • project 2 —

Current Focus

  • Building tech (TypeScript/Next.js, tRPC, Prisma, AI integration)
  • AI-assisted development workflows (Claude Code, MCP servers, prompt engineering)
  • Open-source tooling for developer experience

Background

20+ years: Developer → Team Lead → Head → Deputy CTO → back to hands-on by choice.

Why hands-on? After a decade leading teams, I deliberately stepped back to sharpen my technical edge. Leadership is more effective when grounded in current engineering reality.

Leadership experience:

Tech:

  • Stack: TypeScript (Next.js 14+, Nest.js, tRPC), Ruby (Rails), Python, SQL/NoSQL
  • AI: Claude, GPT, Gemini, AI-assisted workflows, MCP development
  • Infra: GCP, Docker, Kubernetes, Proxmox, serverless
  • Domains: Fullstack (backend preference), product development, technical architecture

Formation: Computer Engineering Languages: Dutch, English, German

Links

Side note: geocaching, squash, skiing, hiking, travling and good food/wine

Popular repositories Loading

  1. homeassistant-vzug homeassistant-vzug Public

    V-ZUG Home Assistant Integration

    Python 1

  2. WealthPulse-App WealthPulse-App Public

    A modern, self-hosted personal wealth management application for tracking your complete financial portfolio across multiple asset types and custodians.

  3. antigravity-kit antigravity-kit Public

    Forked from vudovn/ag-kit

    AI Agent templates with Skills, Agents, and Workflows

    TypeScript

  4. anthropics-skills anthropics-skills Public

    Forked from anthropics/skills

    Public repository for Agent Skills

    Python

  5. Personal Personal Public

    Repository where I will store my personal documents

    HTML

  6. marvin-template marvin-template Public

    Forked from SterlingChin/marvin-template

    Shell