Don't make these mistakes; otherwise, your cookies might break in productionLook, if you've deployed something that was working perfectly on localhost and suddenly auth stops working in production, you're not alone. This is one of those bugs that doesn't throw a clear error.9 min read·cosmoscribe.hashnode.devAug 10
Authentication Demystified: Every Login Method, Actually ExplainedBasic auth, OAuth, passkeys, TOTP, magic links, SSO. Every major auth method with the real flow and real trade-offs. Here's the full breakdown.13 min read·cosmoscribe.hashnode.devJun 12
How WhatsApp Works Without Internet: Offline Messaging and Sync ExplainedSend a WhatsApp message in airplane mode — it works instantly. Here's how local storage, message queues, and sync actually make that happen.10 min read·cosmoscribe.hashnode.devMay 31
How Instagram Stores Your Reels, Photos, and Drafts Without Losing a FrameMobile uploads are trickier than browser uploads. Pre-signed URLs, chunked streaming, local file writes — here's how it all fits together.12 min read·cosmoscribe.hashnode.devMay 31
React Navigation vs Expo Router: Which One Should You Actually Use?Discover the differences between React Navigation and Expo Router regarding routing, architecture, deep linking, and scalability for production apps.16 min read·cosmoscribe.hashnode.devMay 23
