microservices

Learn how message queues and pub/sub decouple services, why at-least-once delivery demands idempotent consumers, how backpressure and dead-letter queues protect the system, and when microservices are worth the complexity — with a sequenceDiagram of async order processing.

The honest case for each. When a monolith is correct, what microservices actually buy you (and what they cost), Conway's law, and how to spot a fake microservices architecture that's actually a distributed monolith.