The interview consisted of 5-6 hours of whiteboard problems. The pace was very quick, with barely enough time to write the solutions.

Almost the entire time was spent standing at the whiteboard. At least one of the problems was quite long.

The interviewer was late and cut into the next round. He spent my problem-solving time typing into chat on his laptop.

I left the interview expecting a good chance of an offer, as I had solved most of the problems, only running out of time in that case. As a senior candidate, I don't feel the expected value of the return on preparation and time for this interview was worth it, given the probability of no-hire for what seem to have been minor concerns.

Typical questions that can be found on HackerRank, GeeksforGeeks, etc.