--- title: "Omkar Gupta (@OmkarDevtsx) | Hashnode" description: "Omkar Gupta (@OmkarDevtsx) writes on Hashnode. Read their latest articles and follow their work." url: "https://hashnode.com/@OmkarDevtsx" --- @OmkarDevtsx # Omkar Gupta @OmkarDevtsx · Joined December 2025 ### [How Instagram, WhatsApp, Uber & Netflix Would Be Built Today Using Expo Router](https://omkargupta.hashnode.dev/how-instagram-whatsapp-uber-netflix-would-be-built-today-using-expo-router?utm_source=hashnode&utm_medium=feed) A practical deep-dive into production-grade mobile architecture -folder structure, navigation, state, real-time systems, and scalability - all through the lens of apps you use every day. 7 min read · [omkargupta.hashnode.dev](https://omkargupta.hashnode.dev/how-instagram-whatsapp-uber-netflix-would-be-built-today-using-expo-router?utm_source=hashnode&utm_medium=feed) [May 22](https://hashnode.com/posts/how-instagram-whatsapp-uber-netflix-would-be-built-today-using-expo-router/6a10c6751f237623ea35a35a) ### [Expo Router vs React Navigation-Which One Should You Use in 2026?](https://omkargupta.hashnode.dev/expo-router-vs-react-navigation-which-one-should-you-use-in-2026?utm_source=hashnode&utm_medium=feed) A practical, no-fanboy guide comparing both approaches - with real diagrams, code examples, and honest tradeoffs to help you pick the right tool for your app. 6 min read · [omkargupta.hashnode.dev](https://omkargupta.hashnode.dev/expo-router-vs-react-navigation-which-one-should-you-use-in-2026?utm_source=hashnode&utm_medium=feed) [May 22](https://hashnode.com/posts/expo-router-vs-react-navigation-which-one-should-you-use-in-2026/6a10be191f237623ea3230dc) ### [How React Virtual DOM Works Under the Hood](https://omkargupta.hashnode.dev/how-react-virtual-dom-works-under-the-hood?utm_source=hashnode&utm_medium=feed) A simple, step-by-step guide to understanding one of React's most powerful ideas — explained with diagrams, plain English, and zero confusion. 6 min read · [omkargupta.hashnode.dev](https://omkargupta.hashnode.dev/how-react-virtual-dom-works-under-the-hood?utm_source=hashnode&utm_medium=feed) [May 9](https://hashnode.com/posts/how-react-virtual-dom-works-under-the-hood/69ff21c1f239332df4a1ce7f) ### [Setting Up Your First Node.js Application — Step by Step](https://omkargupta.hashnode.dev/setting-up-your-first-node-js-application-step-by-step?utm_source=hashnode&utm_medium=feed) Learn Node.js step-by-step. Install Node.js, use REPL, run JS files, and build your first Hello World server easily today. 6 min read · [omkargupta.hashnode.dev](https://omkargupta.hashnode.dev/setting-up-your-first-node-js-application-step-by-step?utm_source=hashnode&utm_medium=feed) [May 9](https://hashnode.com/posts/setting-up-your-first-node-js-application-step-by-step/69ff1d9bf239332df499320b) ### [Callbacks in JavaScript: Why They Exist](https://omkargupta.hashnode.dev/callbacks-in-javascript-why-they-exist?utm_source=hashnode&utm_medium=feed) Learn what callbacks in JavaScript are, why they exist, how they work in asynchronous programming. Easy examples, diagrams, callback hell explained . 5 min read · [omkargupta.hashnode.dev](https://omkargupta.hashnode.dev/callbacks-in-javascript-why-they-exist?utm_source=hashnode&utm_medium=feed) [May 9](https://hashnode.com/posts/callbacks-in-javascript-why-they-exist/69ff1992f239332df495fe4e)