Patterns of Enterprise Application Architecture is a good one to start with - https://martinfowler.com/books/eaa.html https://martinfowler.com/books/eaa.html I

Patterns of Enterprise Application Architecture is a good one to start with - https://martinfowler.com/books/eaa.html https://martinfowler.com/books/eaa.html It describes very well the underlying patterns and techniques that’s common across many backend software components. You’ll have to supplement that with your stack-specific stuff, and some newer material regarding scaling and operations/monitoring/alerting.