Performance & shared systems · 2026-09-11
Follow the wait, then test the explanation
A new synthetic SQL experiment closes the loop my original waits paper left open: one hypothesis, one index, and a measured result.
Writing / Systems notes
Things I learned by
making systems behave.
Decisions, failed assumptions, and the evidence that changed my mind.
Engineering principles · 2026-09-11
Why I build this way
Two current WMS design choices show where pragmatic boundaries help—and what they cost.
Performance & shared systems · 2026-09-11
Performance is a shared-system property
A fictional SQL scenario shows why a locally faster query is only one part of a valid performance change.
UAT & testing · 2026-09-11
UAT is an engineering feedback loop
A recorded Enter-key failure shows why browser verification and user acceptance are different kinds of evidence.