Asked about Preparing stories and practising for real

Walk me through a project you are proud of.

An answer that works

Two sentences of context, then the hardest problem and how you solved it, your decisions and the alternatives you rejected, and the result with numbers. Be ready to go deep on any part, because the interviewer will choose one.

Reading an answer is not being able to give one. The section that teaches this is Preparing stories and practising for real, 4 hours of Interviewing well.

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