#ordering

Building thoughtful software with AI.Notes from the systems behind the work.

August 4, 2026article

Blocking one store was buying its neighbor an extra case

The order planner rounded a product to whole cases across all the stores, and when one store's line was blocked it re-split the cases without it, so the leftover landed on a store that never asked for it. Now the blocked share is planned, then removed, and the total only ever rounds down.

ordering allocation fail-closed

4m read

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June 24, 2026 4m
A cart README promised a rounding rule the code didn't have
April 30, 2026 4m
The par math that turned a store's permission slip into an order
March 18, 2026 5m
Two taps on my round-up button could buy the same top-up twice

March 17, 2026article

Report said reorder, order screen said nothing needed

Two pages in my ordering system had their own idea of when to buy more. I moved the rule into one module, rewrote its order gate twice in under an hour, fixed a badge that could say order now next to a zero, and added a button that builds an editable draft from the same rule.

inventory replenishment decision-logic

5m read