Definitely All About Berlin. A few years ago, I started documenting how to deal with German bureaucracy as a foreigner. The website grew and grew until it became a well-known resource for immigrants. It has become my full-time job at some point in 2020.
It's been a little over 5 years since I started, and I'm still super stoked about my work. I still enjoy doing the research, rewriting guides a dozen times, and answering reader mail. People seem really grateful for it, and it means a lot to me.