Vishal Singh

@vishal-visi

Root se clarity, skills se freedom.

Joined January 2026

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XP-VISHAL-WEB-DEV-COHORT-2026-BLOGSblog.xpvishal.dev24 posts

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

4d ago · 4 min read · Topic Checklist Why Efficient Storage? Pre-Upload Storage Saving Drafts Local vs Cloud Storage Resumable Uploading Processing & Compression Thumbnails & Previews Feed Caching Models Global CD

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How WhatsApp Works Without Internet: Offline Messaging and Sync Explained

4d ago · 10 min read · ✈ The Setup You're on a flight. Airplane mode is on. You open WhatsApp, type a message to your friend, and tap send. The message appears in your chat instantly — with a small clock icon beside it. Twe

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How Instagram, WhatsApp, Uber & Netflix Would Be Built Today Using Expo Router

5d ago · 14 min read · // Table of Contents Why Simple Folder Structures Fail at Scale Why Architecture Matters in React Native Production-Grade Expo Router Folder Architecture Feature-Based Separation Navigation Archi

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How React Virtual DOM works under the Hood

May 7 · 7 min read · 01 — The Problem Why Direct DOM Manipulation Is Slow Before React existed, developers built dynamic UIs by directly reaching into the browser's Document Object Model (DOM) and mutating it — appending

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How Node.js Handles Multiple Requests with a Single Thread

May 1 · 7 min read · Table of Contents The Single-Threaded Nature of Node.js The Event Loop — The Real Engine Delegating Tasks to Background Workers Handling Multiple Client Requests Why Node.js Scales So Well 01

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Vishal Singh

About

Available for

Vishal Singh's blogs

Recently published

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

How WhatsApp Works Without Internet: Offline Messaging and Sync Explained

How Instagram, WhatsApp, Uber & Netflix Would Be Built Today Using Expo Router

How React Virtual DOM works under the Hood

How Node.js Handles Multiple Requests with a Single Thread

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Vishal Singh

About

Available for

Vishal Singh's blogs

Recently published

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

How WhatsApp Works Without Internet: Offline Messaging and Sync Explained

How Instagram, WhatsApp, Uber & Netflix Would Be Built Today Using Expo Router

How React Virtual DOM works under the Hood

How Node.js Handles Multiple Requests with a Single Thread