How I’d Design WhatsApp (High-Level) | System Design Masterclass for Engineers & Interview Prep

If you had to design WhatsApp from scratch — where would you start? In this high-level system design breakdown, I walk you through how I’d architect WhatsApp, step-by-step, focusing on the big-picture design choices that power one of the most scalable messaging platforms in the world. 🔍 What’s inside: 🧱 Client-Server Architecture (mobile, web) ✉️ Messaging Flow & Real-Time Communication 🔐 End-to-End Encryption — simplified overview 👥 Group Messaging & Fan-Out Strategy 🗄️ Message Storage & Sync Logic 🌐 How to Scale to Millions of Users Globally 👇 Drop a comment if you'd design it differently! #SystemDesign #WhatsApp #HighLevelArchitecture #ScalableSystems #EngineeringInterviews #MessagingApps