what do you mean by 'modern backend'? backend is pretty legacy except for the SSR node.js movements these days as far as I can tell, maybe some Go-lang microservices too.
Maybe in my head 'modern' is the wrong word, I just meant web backend on modern stack (yes, in go), or at least backend for recent startups with everything in the cloud etc. While I don't really agree with using a shiton of cloud services (especially coming from embedded without even dynamic allocations), it does make for interesting problems related to distributed messaging and things like that.