You prepare by making sure all your bases are covered. In my daily work discussions, for example, I tend to be very hand-wavy about concurrency, calling everyth

You prepare by making sure all your bases are covered. In my daily work discussions, for example, I tend to be very hand-wavy about concurrency, calling everything “locks” and hoping people understand that I can dig down into the details when needed. When I’m interviewing I don’t want to just hope, so I review my concurrency primitives to try and make sure I won’t put my foot in my mouth.