Hey, I'm Stefan 👋

Senior Software Developer & Software Architect based in Munich, with 20+ years of experience building and running microservices and IT architectures. Current focus: .NET Core, Kubernetes, and AI-driven software development (Claude Code).

🚀 What I do

• Architecture & Backend: .NET Core (containerized), Clean Architecture, Microservices
• Infrastructure: Kubernetes, Terraform, Azure (WebApps, Tables, Blobs), Docker
• AI-assisted development: Claude Code at work for end-to-end delivery — from concept through documentation (Confluence, Jira) to production. Privately, I run OpenCode with models like MiMo V2.5, Laguna S 2.1, GLM 5.2, DeepSeek V4 Flash and North Mini Code
• Observability & Ops: Sentry, Loki/Grafana, Uptrends, Quartz.NET
• Search & Data: Solr, vector search, MariaDB, InfluxDB, MongoDB

Currently at TENHIL GmbH & Co. KG, responsible for migrating background workers to Kubernetes, building an MCP server for a ChatGPT integration, and establishing a production-ready AI development workflow for the team.

🔭 More about me

• 📄 My full CV & project portfolio: stefankoelle.de
• 🏠 I run an extensive homelab: Proxmox, Kubernetes, MQTT, InfluxDB, home automation, retro computing (Atari ST, Amiga, MiSTer FPGA)
• 🐘 My software roots go back to 1992 (Pascal, Assembler, GFA Basic on the Atari ST)

🔗 Links

• 🌐 Website / CV: stefankoelle.de
• 💼 TENHIL GmbH & Co. KG

📌 Pinned

See pinned repositories below for current projects.

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📫 Reach me via stefankoelle.de (contact details in the imprint)