End-to-end encrypted messaging with offline delivery, group chats, and media sharing at billions-of-messages scale.
Native app with E2E encryption, offline queue, and local SQLite cache.
Maintains millions of persistent TCP/WebSocket connections with heartbeat.
Routes messages to recipient's gateway server using presence lookup.
Tracks online/offline status and last-seen timestamps. Redis cluster.
Stores undelivered messages until recipient reconnects. TTL-based expiry.
Fan-out for group messages, membership management, admin controls.
Image/video/audio upload, thumbnail generation, and encrypted storage.
Cassandra cluster for message persistence with per-user partitioning.
Encrypted blob storage for media files with CDN distribution.
Explore this architecture with animated data flows, node auditing, and AI-powered analysis.
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