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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 websites count billions of unique visitors without storing everyone
Data Structures•22 min read•2026-07-21

How websites count billions of unique visitors without storing everyone

The mathematics behind HyperLogLog and why Redis can estimate billions of unique users using only kilobytes of memory.

RedisHyperLogLogProbabilistic Data StructuresSystem Design
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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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bash • guest@darshiii

guest@darshiii:~$ cat about.md

# 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

Curiosity Explorer • Tech Enthusiast

Research Sandbox

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