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Design a Chat App like WhatsApp

Chat for a billion users: sockets on gateways, Redis pub/sub routing, an inbox per device, receipts, media in S3, encryption and regions: one-hour boards for junior, senior and staff, with the theory behind them.

chatwebsocketsredis-pubsubdynamodbend-to-end-encryptionmulti-regionawsinterview-board

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Outline of the design layout

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