I'd say learn about software architecture patterns and how to manage complexity. A good starting point is http://www.aosabook.org/en/index.html http://www.aosab

I'd say learn about software architecture patterns and how to manage complexity. A good starting point is http://www.aosabook.org/en/index.html http://www.aosabook.org/en/index.html. Most backend engineering is about managing complexity and that book has a lot of good information on how to do that.