I reviewed every defect logged across the platform over six months and grouped them into recurring patterns. Many traced back to states the designs never defined: empty or missing data, hidden fields that still ran their logic, screens that stayed stale until a refresh, interruptions like a call arriving mid-task, long or translated text, and multi-step flows with no defined exit paths.

I turned those patterns into design standards, so every design now accounts for those states before handoff, and introduced a bug-focused design review where the team checks new work against them. I shared the findings with engineering as well, since many of the same patterns pointed to gaps in testing.