RKRajesh Kumarinmobil-dev2026.hashnode.dev·May 31 · 13 min readHow Instagram Stores Reels, Photos, and Drafts Behind the ScenesYou record a Reel.Add music.Trim a few seconds.Pick a cover.Then instead of posting it, you tap Save Draft and close the app. When you come back later, the draft is still there. That small moment feel00
RKRajesh Kumarinnodejs-dev.hashnode.dev·May 23 · 8 min readHow Netflix Would Be Built Today Using Expo Router?When beginners build a movie app clone, they usually focus on the UI: making the carousel scroll smoothly and ensuring the posters look good. But if you are building the actual Netflix app, the UI is 00
RKRajesh Kumarinnodejs-dev.hashnode.dev·May 22 · 16 min readExpo Router vs React Navigation - Which One Should You Use in 2026?Navigation is one of the first “simple” problems that becomes complicated in a real React Native app. At the beginning, it feels easy: navigation.navigate("Profile"); But after a few weeks, your app m00
RKRajesh Kumarinmobil-dev2026.hashnode.dev·May 9 · 7 min readHow React Virtual DOM works under the HoodImagine you own a beautiful house. One day, you decide to change the color of the front door from red to blue. If you hired a traditional construction crew, they might demolish the entire house and re00
RKRajesh Kumarinnodejs-dev.hashnode.dev·May 8 · 6 min readHow Node.js Handles Multiple Requests with a Single ThreadWhen developers first learn about Node.js, they usually encounter a statement that sounds completely contradictory: "Node.js is single-threaded, yet it can handle tens of thousands of simultaneous use00
