Its a bit of a SWE bonzai tree, but I built a Spring Application framework I'm using for personal projects https://github.com/Demilich-Digital/henge/tree/main/

Basically, a modulith framework you can fork out to microservices. I don't get to claim to solo dev the next Bing thing, but I have codified and learned a lot of distributed system best practices and explored Spring and Convergent consistency methods.