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Lakshay Dhoundiyal·Sep 12

The Hidden Distributed System Behind YouTube’s “Continue Watching” Button 🎬⚙️

How YouTube saves your playback progress, syncs it across devices, and makes one tiny timestamp feel like magic

10 min read·lakshaydhoundiyal.hashnode.dev

Lakshay Dhoundiyal·Sep 4

How Does Gmail Know a Username Is Already Taken in Milliseconds?

The system-design concepts behind username availability checks, database indexing, caching, APIs, and low-latency distributed systems

10 min read·lakshaydhoundiyal.hashnode.dev