My biggest bone to pick with this interview process (I was also interviewed, passed the interview and then trained to do interviews) is that the calibration is all over the place.
If you're lucky, you'll get an interviewer who thinks that if you can solve a case insensitive palindrome, it means you should be hired with strong confidence.
But if you're unlucky, you'll end up with a person who will squeeze the last ounce of blood out of you, and even if you solve 99% of the questions correctly, he will still think you're low confident or even a no-hire because you missed that one edge case...
If you're lucky, you'll get an interviewer who thinks that if you can solve a case insensitive palindrome, it means you should be hired with strong confidence.
But if you're unlucky, you'll end up with a person who will squeeze the last ounce of blood out of you, and even if you solve 99% of the questions correctly, he will still think you're low confident or even a no-hire because you missed that one edge case...