a public brain dump

I write things down
before I lose them.

Mostly I write things down so I can find them again later. If any of it helps someone else figure out the same thing, even better. No fixed theme, no schedule, just whatever I'm learning.

Latest

What I've been writing.

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2026-07-29 ↗

Building a Thread-Safe Rate Limiter in Java

Two algorithms, one clean design, and the concurrency details that actually matter — from the token bucket all the way to a lock-free version with CAS.

Java Concurrency System Design
About me

Hi, I'm Fazal.

I'm a software engineer. I like understanding how things actually work, not just getting them to run. When I finally figure something out, I write it down so it sticks, and I keep those notes here in the open. If they save you an afternoon too, even better.

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