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 Do you want to learn more about System Design? Join Our System Design Masterclass: https://www.udemy.com/course/system-d... Stay in Touch: Website -: https://www.sweetcodey.com LinkedIn -:   / sweet-codey   Instagram -:   / sweetcodey   🎥 Subscribe to our channel for more such content:    / @sweetcodey   𝗗𝗼 𝗹𝗶𝗸𝗲, 𝘀𝗵𝗮𝗿𝗲 𝗮𝗻𝗱 𝗰𝗼𝗺𝗺𝗲𝗻𝘁!! 𝗛𝗮𝗽𝗽𝘆 𝗹𝗲𝗮𝗿𝗻𝗶𝗻𝗴!! #SystemDesign #NotificationSystem #BackendEngineering #SoftwareArchitecture #ScalableSystems #DistributedSystems #APIDesign #TechEducation #InterviewPrep #SystemDesignInterview