One quarterly number almost got double-counted across two reports.
Two dashboards were quietly tracking overlapping data. Caught before it went out now there's one source of truth the reports pull from, not two that can disagree.
→ A good number is only as good as the one place it actually comes from
One segment got the wrong product recommendation block.
A tagging mismatch sent one segment content meant for another. Caught it fast, fixed the mapping logic between segment tags and content blocks to be far stricter.
→ More personalization means more places a small mapping error can hide.
The email felt like it was written just for one person. It sort of was.
A subscriber replied asking how the team knew exactly what they needed the honest answer was that their own past behavior wrote the email, automatically, along with a few hundred others.