Replaced a dozen ad-hoc patterns with one predictable store; state-related bug reports dropped 70%.
See the full storyProof of work
The end-to-end tests were flaky enough that the team had learned to re-run until green, which meant they caught nothing. I rebuilt them around real user journeys, killed the timing hacks, and got the suite back to where a red build actually meant something broke.
Replaced a dozen ad-hoc patterns with one predictable store; state-related bug reports dropped 70%.
The app was unusable for anyone on a screen reader or a keyboard, and nobody had noticed because nobody on the team worked that way. I made accessibility part of the definition of done — fixed the semantics and focus order, then wired the checks into CI so it couldn't quietly rot back.
Simplified the flow to three steps; checkout completion rose from 29% to 54%.
Every team was rebuilding the same components slightly differently, so the product looked like it came from four companies. I built the shared system, wrote down the decisions behind it, and did the unglamorous work of getting the org to actually adopt it.
Trimmed the critical path and code-split aggressively; LCP fell from 700ms to 350ms on mid-tier devices.
Bring craft and measurement to work that usually gets neither.
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