@SagarKemble

How Instagram Stores Reels, Photos, and Drafts Behind the Scenes

May 28 · 6 min read · The Moment You Hit Record You open Instagram, point your camera at something mildly interesting, and hit record. Fifteen seconds later, you tap "Save Draft" instead of posting because the lighting was

How WhatsApp Works Without Internet: Offline Messaging and Sync Explained

May 28 · 7 min read · The Scenario That Started This Question You're on a flight. Airplane mode is on. You type a message to your friend, hit send, and see a single grey tick appear. No internet. No server. No problem, app

React Navigation vs Expo Router: Which One Should You Actually Use?

May 22 · 6 min read · The Navigation Problem Picture this. You are building a React Native app. You have a login screen, a dashboard, and a profile page. You set up React Navigation, register each screen manually, wire up

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React Native Architecture at Scale: Overview of How Production Apps Are Actually Built

May 22 · 5 min read · The Folder Structure That Feels Fine Until It Doesn't You start a new React Native app. You create a components folder, a screens folder, maybe a utils folder if you're feeling fancy. It works. The ap

How React's Virtual DOM Actually Works

May 8 · 9 min read · You click a button. A counter goes from 0 to 1. You expect React to update the number on screen. Simple enough. But behind that one-digit change, React creates an entirely new tree of JavaScript objec