Jan-stefan Janetzky
IT-Consultant at HTH | IT-Expert:innen
Hennef, North Rhine-Westphalia, Germany
Summary
🤩
Rockstar🎓
Top SchoolJan-stefan Janetzky is a pragmatic IT consultant and senior engineer with 12 years of hands-on experience designing resilient infrastructure, modern web stacks, and mission-critical automation for enterprise and large-scale community projects. He has a proven track record of turning undocumented legacy systems into reliable platforms—managing Proxmox/Docker estates, migrating large DMS deployments with two million documents, and delivering zero-downtime infrastructure for a Discord RPG with 650k+ players. Technically versatile, he spans backend and frontend work (TypeScript, Node.js, Bun, Drizzle ORM, PostgreSQL), low-level C/embedded tooling, and infrastructure patterns including WireGuard, Traefik, Coolify and Kubernetes experiments. An active open-source contributor, he improved stability and UX in the popular Obsidian Dataview plugin, demonstrating attention to edge-case bug fixes and TypeScript hygiene. He’s skeptical of buzzwords (as his GitHub quip about certifications suggests) and leverages AI tooling as a multiplier rather than a crutch, having built RAG-based tooling and documented AI-assisted analyses. Based in Hennef, Germany, he combines deep technical problem solving with a penchant for pragmatic, durable solutions under pressure.
12 years of coding experience
4 years of employment as a software developer
Fachinformatiker für Anwendungsentwicklung, Fachinformatiker für Anwendungsentwicklung at QSC AGFachinformatiker, Fachinformatiker für Anwendungsentwicklung, Fachinformatiker, Fachinformatiker für Anwendungsentwicklung at Georg-Simon-Ohm-Schule Kölnsoftware architecture, web development, and infrastructure, software architecture, web development, and infrastructure at Self-taught education
German, English
Stackoverflow
4,919reputation
4.7mreached
130answers
0questions
timestamp
top-5%
javascript
top-5%
datetime
top-5%
Github Skills (21)
javascript10
typescript10
plugin10
query-language10
typescript-types10
typescripts10
api-design9
markdown9
datetime9
markdown-it9
nodejs9
timestamp9
css8
html6
fetch-api6
Programming languages (24)
Github contributions (5)
blacksmithgu/obsidian-dataview
Aug 2023 - May 2024
A data index and query language over Markdown files, for https://obsidian.md/.
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:2 reviews, 6 PRs, 54 comments in 8 months
Contributions summary:Jan-stefan primarily focused on improving the functionality and stability of the Obsidian Dataview plugin. Their contributions include fixing rendering issues related to Markdown API changes and properly escaping characters within links. Additionally, the user added features like `overflow-x: auto` to codeblocks, improved the view rendering by moving CSS embedding to the top of the view container, and addressed other bug fixes like undefined `verNum`. They also made typescript enhancements.
queryindexquery-languageobsidian-mdperformance
factormystic/FMUtils.WinApi
Sep 2015 - Mar 2024
Contributions:1 PR, 1 comment in 8 years 7 months
pythoninvoke
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