Holger Slomka

IT Systems Architect · DevOps · Middleware · SAP

Designing reliable platforms for complex landscapes

Almost three decades across SAP, middleware, and modern automation. I build resilient environments that ship safely and run smoothly.

Live from the skill graph

Skills as git branches

Each branch below mirrors a capability area; individual commits are hands-on skills. The diagram is generated dynamically from the skills API.

Mindmap controls
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Readable view

Skills by capability domain

Delivery highlights

Recent projects

A quick timeline of engagements where architecture, automation, and reliability came together.

Under the hood

How this site is built

Simple, reproducible architecture showing the same stack I use in client work.

API layer

FastAPI serves skills and projects over JSON with CORS enabled. The app is containerized for CI/CD and reverse-proxied by Caddy. Explore the live docs at api.holgerslomka.net/docs.

Data layer

PostgreSQL stores branches/commits for skills plus project timeline entries. Schema is versioned and seeded via SQL for repeatable deploys.

Frontend

Vanilla JS fetches the API, renders Mermaid graphs (git graph + mindmap), and builds a timeline UI. The scrollable mindmap combines Mermaid SVG output with svg-pan-zoom for smooth zoom, pan, and reset controls. No frameworks, just fast static assets.

Deployment

Deployment uses Gitlab CI/CD pipeline and Gitlab-runners. The application is containerized for CI/CD and reverse-proxied by Caddy, ensuring smooth deployment and scalability.

Collaboration

Let us build your next release

Available for architecture reviews, project management, and DevOps leadership. Based in Southern Bavaria, available remotely across time zones.