System Design - WhatsApp
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System Design - WhatsApp
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About this listen
If you get "Design WhatsApp" in a system design interview, where do you start? We break down the core components: the Presence Service (last seen/online status), the Message Service, and the Notification Service. Learn how to handle "the double-check" (acknowledgment logic), manage message ordering with sequence numbers, and why Cassandra is the go-to choice for storing trillions of chat messages.
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