Messaging & Event-Driven

RabbitMQ vs Kafka, work distribution vs fan-out, replay, consumer groups, and hybrid patterns

Broker architecture, partitions, ISR, consumer groups, offset management, delivery guarantees, and storage internals

Events vs commands, pub/sub, event sourcing, CQRS, schema evolution, and debugging async flows

Separate write & read models, projections, sync strategies, eventual consistency handling, and when to use

Exponential backoff with jitter, poison message handling, DLQ monitoring, and reprocessing workflows