Asked about Being drilled on your own work

Tell me about something in your work that did not work.

An answer that works

State what happened, what it cost, how you found out, what you did immediately, and the change that means it cannot recur. Keep the tone flat. Minimising and performing remorse both read as avoiding the technical content, which is what the question is actually after.

Reading an answer is not being able to give one. The section that teaches this is Being drilled on your own work, 4 hours of Interviewing well.

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