How to design WhatsApp

Master high-scale messaging by mastering DynamoDB optimization and multi-device synchronization while navigating the critical trade-offs of distributed delivery guarantees and ZooKeeper coordination for production-ready chat architectures. * **Distributed messaging trade-offs** and delivery guarantees * **DynamoDB GSI optimization** for high-volume chat data * **ZooKeeper coordination** for real-time connection management * **Multi-device data modeling** for seamless state synchronization

4 sections ยท 10 lessons

Course outline

Database Design

  1. DynamoDB GSIs
  2. Data Modeling

Message Routing

  1. Kafka Limits
  2. Redis PubSub
  3. ZooKeeper Role

Service Discovery

  1. Consistent Hashing
  2. Chat Registry

Device Sync

  1. Device IDs
  2. Sequence Numbers
  3. Multi-Device Delivery

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