Sweet spot is definitely low(ish) level stuff in C/C++ (interested in dabbling into Rust, Zig and Odin). I work for a software service company, so unfortunately my 9/5 is generally catered towards mainstream, writing Swift for iOS, Kotlin for Android, some JS web dev... it depends on the project. A recent project was a CLI in Go which was pretty cool, and we have an upcoming one for Linux drivers, so I always look forward to those since they're more aligned with what I actually enjoy writing.

Hopefully one day I can start working on some BTC-related projects, I just haven't found the time to get into a side hustle like that yet