<ul><li>WhatsApp Chat high-level system design includes functional and non-functional requirements along with assumptions.</li><li>Functional requirements involve 1-to-1 chat, last seen feature, group chat, and text-only communication with end-to-end encryption.</li><li>System design considerations include capacity estimations for users, messages per day, and real-time communication needs.</li><li>Implementation details cover features like last seen status using Cassandra, 1-to-1 chat with WebSockets, and group messaging with Kafka clusters.</li></ul>

High-Level System Design: WhatsApp Chat

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