Insights

Engineering decisions, up close

Close readings of specific decisions from real cases — no generic advice and no blogging for its own sake.

Why an automated product match is never treated as a fact

In the price-monitoring case, the algorithm only proposes a match candidate. A person always makes the call — here is why that is a deliberate constraint, not a shortcut left unfinished.

Read 2026-09-04

Deduplicating candidates when a platform redelivers the same event

An external hiring platform can redeliver the same event under a new identifier. Checking that one ID is not enough — here is what was used instead.

Read 2026-09-04

What to do when a payment terminal doesn't answer: a queue instead of a guess

When a remote payment result is unknown, there are two easy but wrong defaults — treat it as success, or treat it as failure. The rental operations system picked a third option.

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