Johannes Krumm is a tech lead in Munich. I own a core domain at IU International University, design event-driven systems with DDD and Kafka, and build AI agents that run in production.https://jkrumm.comhttps://jkrumm.com/guide/agent-infrastructurehttps://jkrumm.com/guide/agent-infrastructureOne engine, one loop, one front door, one cockpit: how my coding agents are wired, and what I deleted to get there.Sat, 10 Oct 2026 00:00:00 GMTagentsinfrastructurehttps://jkrumm.com/blog/flicker-free-dark-mode-in-astrohttps://jkrumm.com/blog/flicker-free-dark-mode-in-astroCorrect on the very first paint after a hard refresh, no flash, three-way light/system/dark — how I built a theme toggle on a fully static Astro site with an inline script, data-theme tokens, and a Motion-driven control.Tue, 07 Jul 2026 00:00:00 GMTastrofrontenddark-modehttps://jkrumm.com/blog/zero-downtime-deployshttps://jkrumm.com/blog/zero-downtime-deploysHow Rollhook rolls containers one by one behind a proxy — health checks, draining, and webhook-driven releases with no dropped requests.Tue, 10 Feb 2026 00:00:00 GMTinfrastructuredockerdeployshttps://jkrumm.com/guide/personal-stackhttps://jkrumm.com/guide/personal-stackA tour of the tools behind my AI-coding setup, homelab and VPS — and why each one earned its place.Thu, 15 Jan 2026 00:00:00 GMTstacktooling