What is a message queue, and when should backend processing be moved into an asynchronous queue?
~4 min by voice
How to approach it
They're checking whether the candidate understands why you decouple creating work from doing it, in which tasks asynchrony is really justified, and what delivery guarantees (ack, redelivery, idempotency) come with it.
The interviewer will ask this question and listen. Think out loud and ask for a hint if you need one. When you're done, pause or tap “That's my answer”. In about a minute, your score and the points you covered show up here.