ByteDance interview questions

Extremely slow interview process, I applied in June and got a call in August. I have had 3 rounds so far and have to follow up and wait for 10 days after every round for the feedback.

The whole hiring process is so messed up. I got my interview postponed many times which I'm okay with it at first because I think it's a great opportunity if I get a chance to work here. But then the hiring manager cancelled the interview at the last minute and the HR informed me 15 minutes right before the actual interview time. This whole thing really leave me a negetive impression and indicate that the whole hiring process is so unprofessional.