TBH get comfortable with writing a web server in your favorite language and a popular framework e.g. flask (python), go (gorilla/mux), nodejs (express). Then tr

TBH get comfortable with writing a web server in your favorite language and a popular framework e.g. flask (python), go (gorilla/mux), nodejs (express). Then try using it to make calls to an external system like a database. As a backend developer you should have a good feel for the data flow through the application stack. There's nothing special about backend development, its mostly about the "plumbing" between systems. Lots of de(serializing) (e.g. json, protobuf) messages into objects and validation of those messages