I've started using C++ for the REST backend for a mobile app recently.

I'm using restinio for the REST layer (sadly deprecated a couple of months ago, but it still seemed like the best option in terms of clean interface) and sqlite for the DB layer.

I've architected it all so I have a purely insert-only and order-independent DB on the write-side, so litestream was seeming like a good fit for single-writer, multiple readers, but now that's been abandoned, I'll wait until litefs stabilises, or roll my own to do what I need.

I originally started the REST side in dart so I could share code with the flutter client app, but I soon realised that performance wasn't where I wanted it to be and that the backend queries were all very different to client side anyway, so it seemed easier just to create the REST side in C++. I should add that my normal work has been predominantly C++ for many years so it's more familiar to me than learning something else and also being able to hit the sqlite layer directly without another abstraction layer seems beneficial.

I was planning to use litestream to distribute the sqlite DB to multiple readers, but now that's deprecated, I'll probably look into doing my own in C++ later on if his new focus on litefs doesn't work out for me.