Walk me through a project where a customer-specific implementation led to a reusable improvement. What did you own and verify?

Practice task

Choose a project where you personally implemented or proposed a reusable improvement. Show the original behavior, the repeated need, your artifact, an alternative you rejected or retained, and the outcome you can substantiate. Distinguish a proposal, tested implementation, customer adoption and measured savings.

If you lack a customer example, state that and work through this fictional connector case. Adapter A reads requested_date and confirmed_date; adapter B reads a dispatch_date defined by that source as confirmed. Both need validation and an operator-visible confirmed or unresolved result. Requested and confirmed dates have different business meanings.

Propose the smallest useful shared boundary, explain which rules stay in each adapter and identify tests that would show whether the change preserves behavior. Compare it with keeping the adapters separate. Do not claim the supplied design or outcomes as your own past work.