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Exploring Tech & Sharing Notes

Curiosity-driven write-ups on systems engineering, database internals, and visual computer science notes.

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How large-scale systems check username availability in milliseconds
Data Structures•11 min read•2026-07-03

How large-scale systems check username availability in milliseconds

The Bloom filter trick that helps avoid millions of unnecessary database queries.

System DesignDatabasesAlgorithmsPerformance
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# Curiosity Sandbox

I'm a developer building for fun and systems curiosity. I write databases from scratch (like runDB), experiment with async event-loops (epoll), and explore complex backend concepts. This blog is my visual sandbox for sharing what I learn along the way.

guest@darshiii:~$ whoami

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