Lld
Low-Level Design
Hard
Real-time Chat Application
Design a real-time chat application that supports one-on-one and group chats, message delivery status, and user presence (online/offline). Consider how users can create and join chat groups, send multimedia messages, and ensure messages are delivered in the correct order. Plan for scalability to accommodate a growing number of users.
Key concepts
object-orienteddesign-patternsextensibility
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