An early version of this is at edX REST API Conventions, but needs to be updated and fleshed out with more recent wisdom.

12. Domain-drive Design Principles

Build vs Buy → Core, Supporting, Generic
Location of code (which IDA? which app?) → Bounded Context Responsibilities and Boundaries
API as a Product → Domain models
Inter-service interfaces → Business use cases
Inter-service communication and relationships → Bounded Context life cycles versus Entity-based Services

13. Plugins and SOLID Principles

celery-utils capabilities - LoggingTask and PersistOnFailureTask
Using kwargs instead of positional args
For real-time synchronization with management command as fallback of celery failures