When would you move work from an API request into a queue-backed worker?

Move work from the request thread to a queue

Explains when backend work belongs in a queue instead of slow or unreliable inline request handling.

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I would move work to a queue when it is slow, bursty, failure-prone, or does not need to finish before the API returns. The request can validate the command, create a durable job or state record, enqueue a message, and return a status or accepted response. A worker then processes the message with controlled concurrency. That keeps the API responsive while the system still has a durable path to finish the work.

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Request latency, user experience, background workers, job state, retries, durability, and operational boundaries.

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Queue-backed processing fits work that is slow, bursty, failure-prone, or allowed to complete after the API response. The design must preserve a durable acceptance boundary and give callers an honest way to observe the eventual outcome.
I would move work to a queue when it is slow, bursty, failure-prone, or does not need to finish before the API returns. The request can validate the command, create a durable job or state record, enqueue a message, and return a status or accepted response. A worker then processes the message with controlled concurrency. That keeps the API responsive while the system still has a durable path to finish the work.
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I would keep the boundary explicit. If the user needs an immediate answer, a queue may not fit. If the work is an export, email, image processing task, integration sync, or notification, a queue is often better because retries and capacity can be controlled outside the request path. I would also expose job state so users and support can see queued, running, completed, failed, or cancelled outcomes.

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Using a queue just to avoid thinking about latency or state.
Returning success before the work is durably recorded.
No job status or support visibility.
Assuming the worker runs each message exactly once.

When would you move work from an API request into a queue-backed worker?

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