Indexes I added, then removed
Three index changes that looked obvious in review and cost more than they saved once real traffic arrived.
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Idempotent consumers, without the ceremony
What actually happens when the same message arrives twice, and the smallest set of changes that makes a consumer safe to retry.
Designing a URL shortener
The classic interview system, built small and measured: where the reads go, what the cache is for, and the one decision that made everything else easy.
Sharding vs partitioning
Two words used interchangeably in meetings, and the operational difference that makes them not the same thing at all.
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If this note raised a question, or you would have designed it differently, I would like to hear it.
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