I'm Michel Frenken, a backend engineer from Germany. I build distributed systems with Kotlin, Spring Boot and Kafka in the energy sector — the kind of software where an unnoticed bug doesn't just break a page, it breaks a process.
This blog collects notes from that work: production war stories, migrations and debugging sessions, side projects, and occasional takes on what is happening in software. Articles are written in English; some get a German translation.
The site itself is a static Astro build — no trackers, no cookies, no CMS. How it was built is the first article.
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