I’m Jan, a software and security engineer based in Munich. I contribute to building Tweeener, where we empower tennis people to explore planning and management on their own terms.
My Last Years: Scaling ZK-Rollups, Coaching Pro Tennis, and a New Chapter Life has a funny way of taking you on wildly different, yet equally intense paths. If you looked at my calendar over the past year, you would have seen a chaotic, beautiful spl...
3 Years of Self-Hosting Mail: How I Run a Bulletproof Mailcow Server in production. Self-hosting an email server has gained a reputation as a modern tech horror story. If you mention it on Reddit or Hacker News, you will inevitably be flooded with wa...
Beyond Blind Trust: My Journey in Privacy-Preserving Cryptography and Data Sovereignty We’ve all heard the foundational rule of the internet: Don't trust, verify. But as a computer engineer and researcher, I’ve spent the better part of my career aski...