L5 · Intermediate
Chat Application (WhatsApp-like)
Problem
Design a messaging system supporting 1-on-1 chats, group chats, message status, and media sharing.
Requirements
- One-on-one messaging
- Group chats (create, add/remove members)
- Message status: Sent, Delivered, Read
- Send text, images, and documents
- Online/offline status
- Message history and search
Constraints
- –Group can have max 256 members
- –Media files max 100MB
- –Messages stored for 30 days
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