"My work is not measurable" almost always means "I have not looked for the measure yet".
Four angles that always exist
- Volume: how many tickets, accounts, articles, releases, clients
- Time: how long something took before and after you touched it
- Money: revenue touched, cost avoided, budget managed
- Quality: error rate, rework, complaints, uptime
Estimates are allowed
"Roughly 60 invoices a week" is a legitimate number if you can defend it in interview. Precision matters less than scale — the reader is calibrating how big your world was.
Keep the before and after
"Cut onboarding from three weeks to eight days" carries the change. "Improved onboarding" carries nothing.
Common questions
What if I genuinely have no metrics?
Use volume and time. How many of the thing did you handle, and how long did it take?
Is it dishonest to estimate?
Not if the estimate is reasonable and you can explain how you arrived at it.