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Lottie: How Airbnb Replaced GIFs with JSON Animation

1h ago · 3 min read · If you have dropped a Lottie into a loader or success screen, often via LottieFiles, you already know the DX. The interesting question is why the format exists. GIF and video exports win on “just play

Long Tasks and Main Thread Blocking: Breaking Up the Work

2d ago · 11 min read · Related: Core Web Vitals and Lighthouse Explained INP is the Core Web Vital that Long Tasks directly destroy. A Long Task is any main-thread task that runs for more than 50ms without yielding. During

How Aadhaar Deduplicates Biometrics at Billion Scale

4d ago · 4 min read · The hardest part of Aadhaar is not storing rows: it is de-duplication: ensuring a person does not receive two identities when the archive already holds over a billion enrollees. Each new application m

Building Offline-First Web Apps with localStorage: A Practical Guide

4d ago · 8 min read · You're building a tiny tool. Maybe a notepad. Maybe a settings panel. Maybe a draft autosave for a form. You don't want a database. You don't want a backend. You don't even want a login. localStorage.setItem(key, value) solves the problem in one line...

The WiFi QR Code Format Decoded: Build One Yourself in 30 Lines

4d ago · 8 min read · You've scanned one a hundred times. The cafe printed a QR code, you pointed your phone at it, and you joined their WiFi without typing the 32-character password. What's actually encoded in that little black-and-white square? The answer is shorter tha...