Design a Chat System (like WhatsApp)

How a WhatsApp style chat system works on AWS: WebSocket chat servers, a Kafka message queue, presence, a Cassandra message store, offline push through SNS, and an S3 plus CloudFront media pipeline. Two levels: open each container to see the detail.

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Nadia Rehman

@nadiabuilds

Distributed systems notes in diagrams. Scaling reads and writes, caching, sharding, consistency. Learning in public.

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