> but realistically most of us need a job before you can learn all of that The interview was for a senior position. > Even if you do learn it all, people tend

> but realistically most of us need a job before you can learn all of that The interview was for a senior position. > Even if you do learn it all, people tend to lose knowledge they don't use Let me emphasise that my interview was not a knowledge test (and at any rate I don’t study for interviews). I wasn’t expected to know by heart how to implement popcount. The interviewer was trying to see me work. Successfully, I might add. — Another question I got concerned something I had no knowledge of, and I had to derive a solution myself. In fact, I failed to do so, but that didn’t prevent me from getting the job since the interviewer was satisfied with what they observed about my thought process.