Question 5Ownership and working with customers
Tell me about something you shipped that broke in production.
Everyone has broken production. They want to hear you own it and change something afterwards.
“Full ownership mentality in ambiguous, fast-changing environments; ability to navigate competing priorities across Product, Engineering, Sales, Support, and Services”Mission Engineer · Axon
The answerFour steps
- 1
What broke and who it affected
Say it like this
“Orders placed after 7pm landed on the next day, so about 340 orders were booked into the wrong month right before their month-end close.”
Why it scores
A real bug with a size and a business cost, not a minor glitch.
- 2
How you found out and what you did in the first hour
Say it like this
“Their finance analyst spotted it. Within the hour I rolled back, wrote a query listing every affected order, and sent their controller the list.”
Why it scores
Rollback plus a clear list for the customer. Damage control before the full fix.
- 3
The root cause, said plainly
Say it like this
“The cause was mine: I converted timestamps to UTC twice, and every test used noon timestamps, so none crossed midnight.”
Why it scores
Says “mine” and gives the technical cause in one line. No hiding behind the team.
- 4
What you changed so it can't happen the same way again
Say it like this
“I added test cases around midnight and daylight saving changes, and a daily check that compares order counts per day in both systems and alerts on any gap.”
Why it scores
Two changes: tests that would catch it, and a check that would catch the next unknown bug.
StrongAll together
About a minute, out loud. The marked parts are the four steps; hover one to find it above.
I changed a nightly sync that moved orders from a customer's online store into their accounting system. Orders placed after 7pm landed on the next day, so about 340 orders were booked into the wrong month right before their month-end close.1 Their finance analyst spotted it. Within the hour I rolled back, wrote a query listing every affected order, and sent their controller the list.2 The cause was mine: I converted timestamps to UTC twice, and every test used noon timestamps, so none crossed midnight.3 I added test cases around midnight and daylight saving changes, and a daily check that compares order counts per day in both systems and alerts on any gap.4
WeakThe answer that fails
Sounds fine. Common. Scores low.
“We had a bug in a release that caused some data issues for a customer. Our team investigated, found the problem, pushed a hotfix the same day, and I learned to test more carefully.”
Interviewer's note
“We” and “some data issues” hide who did what and how bad it was. “Test more carefully” changes nothing.
PracticeTwo minutes, then they push back
Your turn
Tell me about something you shipped that broke in production.
Answer like you're in the room: about two minutes, no notes. Say it out loud, even alone. It feels different from thinking it. Then check your answer against what interviewers score.