A simple explanation of Message Queues in the context of system design interviews. 

Excalidraw used in video: https://link.excalidraw.com/l/56zGeHiLyKZ/47SJUcqLNbg

00:00 Intro
00:48 Motivating example
04:17 What is a message queue?
12:47 When to use a message queue?
15:06 Common deep dives
23:31 Example technologies: Kafka, SQS, RabbitMQ
25:42 Conclusion

Guided Practice: https://www.hellointerview.com/practice

Deep dive and video on kafka is here: https://www.hellointerview.com/learn/system-design/deep-dives/kafka

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https://www.linkedin.com/in/evan-king-40072280/

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YouTube

A comprehensive guide to message queues in the context of system design interviews, presented by a former Meta staff engineer. Covers the core motivation for queues using a photo-upload example, then explains key mechanics: acknowledgements, delivery guarantees (at-least-once, at-most-once, exactly-once), idempotency, and when to use queues. Deep dives include partitioning and partition key selection, consumer groups, back pressure, poisoned messages and dead letter queues, and durability via replication. Compares Kafka, AWS SQS, and RabbitMQ as technology choices, with Kafka recommended as the interview default.

Message Queues in System Design Interviews w/ Meta Staff Engineer