Behavioral question
Tell me about a time a customer was unhappy
They want the customer’s actual complaint, not your summary of it, and a repair that goes past a refund. If you only apologized, you handled a mood. If you changed the product or the process, you handled the cause.
Check this example, then replace it
The box starts with one STAR answer. Read the scores, then delete it and paste a story from your own work. Scoring stays in the browser.
87/100
Strong
About 58 seconds spoken · 144 words. Spoken time uses 150 words per minute.
Feedback
- This has a clear STAR shape. Only keep numbers you can defend out loud.
Which sentence is which
In June 2023 a customer emailed that our invoice PDF had dropped their tax id, and their accountant was rejecting 5 months of bills. I was responsible for the account and for whether this was a one-off. I pulled their last 5 invoices, found the id blank whenever the tax form was saved mid-edit, and wrote a fix that kept the previous id until the form was complete. I then regenerated those 5 PDFs and sent them with a short note the same day. I added a regression test for a mid-edit save so a blank tax id could not ship on a PDF again. The result was the accountant accepting the packet, the customer renewing a 14-seat plan, and the blank-id bug gone for every account. Support saw that ticket type fall from 9 a week to 0.
Why this example holds up
You quote the problem in their terms (tax id, accountant), you check whether it is only theirs, and the renewal is a result a interviewer can picture. The support count shows it was not a favor for one logo.
How to answer “Tell me about a time a customer was unhappy” with STAR
- Situation. Set the scene in one or two sentences: when it was and what was already wrong. For example: In June 2023 a customer emailed that our invoice PDF had dropped their tax id, and their accountant was rejecting 5 months of bills.
- Task. Say what you personally owned. For example: I was responsible for the account and for whether this was a one-off.
- Action. Say what you did, in order, with I. For example: I pulled their last 5 invoices, found the id blank whenever the tax form was saved mid-edit, and wrote a fix that kept the previous id until the form was complete.
- Result. End on the change, with a number you can defend. For example: The result was the accountant accepting the packet, the customer renewing a 14-seat plan, and the blank-id bug gone for every account.
Mistakes on this question
- A refund with no product change, told as if it were heroic.
- Blaming the customer for not reading docs.
- No sign they stayed or left. The relationship is the point of the question.
How to practice it
Use the customer’s noun, not your internal one. “Tax id” beats “the billing entity field.”
FAQ
What if the customer left anyway?
You can tell that story if you fixed the cause for the next customer and you say so. Do not pretend a lost account was a win.
Should I name the company?
Skip the name unless it is already public. The seats, the bug, and the renewal are what matter.