Chapter 29: Feeds, Notifications & Real-Time Messaging

Feeds, notifications, and real-time messaging turn high-volume events into ordered, personalized, and timely user experiences. The chapters in this category cover delivery orchestration, feed generation, real-time synchronization, and predictive search.

• 29.1 System Design: Multi-Channel Notification System (Rate Limiting, Dispatchers, Delivery Tracking)
• 29.2 System Design: High-Scale Newsfeed System (Fan-Out on Write vs Fan-Out on Read, Aggregation from Multiple Sources)
• 29.3 System Design: Global Real-Time Chat System (WebSocket Clusters, Message Sync, Room Routing, Presence Tracking)
• 29.4 System Design: Search Autocomplete System (Trie Indexing, Frequency Ranking, Real-Time Cache Update)
• Chapter 29 References