How WhatsApp Works Without Internet: Offline Messaging and Sync ExplainedIntroduction Imagine opening WhatsApp, switching your phone to Airplane Mode, and sending a message to a friend. The message immediately appears in your chat. It feels like it has been sent successfulMay 31 · 7 min readanshdeep.hashnode.dev
How Instagram Stores Reels, Photos, and Drafts Behind the ScenesEvery Day, millions of users open Instagram to upload photos, record reels, save drafts, and scroll endlessly through media content. But behind this smooth experience there is a complex system designeMay 25 · 7 min readanshdeep.hashnode.dev
How Instagram, WhatsApp, Uber & Netflix Would Be Built Today Using Expo RouterModern mobile applications are no longer “just apps.”They are large distributed systems running inside a mobile interface. Apps like Instagram, WhatsApp, Uber, and Netflix handles: Millions of users May 22 · 6 min readanshdeep.hashnode.dev
Expo Router vs React Navigation — Which One Should You Use in 2026?In the Modern era of React Native, Developers have two major approaches to handle Navigation in their applications: Traditional navigator-based routing with React Navigation File-based routing with May 22 · 8 min readanshdeep.hashnode.dev
How React Virtual DOM Works Under the HoodThe Problem: Direct DOM Manipulation is Expensive Before understanding the Virtual DOM, we first need to understand why manipulating the Real DOM directly becomes slow. What is the DOM? The DOM (DocumMay 3 · 5 min readanshdeep.hashnode.dev
