BackendDevOps/Cloud
Pub/Sub
Also written as Publish-Subscribe, Event Bus, Message Broker
A messaging pattern where publishers broadcast events without knowing who consumes them, and subscribers receive what they care about — decoupling services from each other.
Think of it like
A noticeboard rather than a phone call: post once, and anyone interested reads it.
Junior or senior?
Junior sounds like
Has consumed from a queue.
Senior sounds like
Talks about delivery guarantees, duplicate handling, or dead-letter queues.
Ask them
“How did you handle a message that failed repeatedly?”