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Async work: queues and workers · designlab

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Part 1 · Module 10

Async work: queues and workers

Move slow and unreliable work off the request path, make consumers safe to retry, and keep backlogs under control.

0 of 4 lessons25 min

10.1Why queuesUp next7m
10.2

Delivery guarantees and idempotent consumers

6m

10.3Ordering, priorities and backpressure6m

10.4Scheduled and long-running jobs6m

LabThe slow PDF exportFinish “The database is the bottleneck” first35m

Practice what this module teaches

Image Processing Pipeline HLDTransform uploads into immutable variants with bounded decoding and retryable jobs.Intermediate45 min Notification Service HLDDeliver email, SMS, and push notifications without losing work during provider outages.Intermediate45 min Webhook Delivery HLDDeliver signed events with retries, endpoint isolation and replayable delivery history.Advanced50 min Distributed Job Scheduler HLDSchedule durable jobs with leases, retries and safe recovery after worker crashes.Advanced55 min