How to Design a Notification System | Must-Know for System Design Interviews

Learn how modern Notification Systems are designed from scratch step by step. In this 1-hour System Design Deep Dive, you’ll understand how platforms like WhatsApp, Instagram, or LinkedIn handle millions of notifications efficiently.

We’ll go from high-level architecture to deep-dive technical insights, covering every major component including APIs, queues, databases, and delivery mechanisms.

Perfect for system design interview prep, backend engineers, and software architects who want a strong understanding of real-world notification infrastructure.

Timestamps:
00:00:00- Introduction
00:01:40- Why do we need a Notification System
00:03:44- Functional Requirements
00:07:15- Non-Functional Requirements
00:12:50- DAU/MAU
00:15:13- Throughput Estimation
00:18:36- Storage Estimation
00:22:03- Memory Estimation
00:22:41- Network or Bandwidth Estimation
00:24:38- API Design: Send Notification
00:28:03- Basic High Level Flow
00:38:26- Problems with Basic High Level Flow
00:42:33- Validation & Prioritization
00:44:18- Rate Limiting Notifications to prevent Spamming
00:45:34- User Preferences
00:48:08- Re-Organizing Services
00:52:14- Handling Different types of Notifications
00:56:45- Decoupling
01:02:25- Deep Dive Insights: Database Selection
01:05:43- Deep Dive Insights: Database Modeling

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