I had 4 sets of 1:1 technical interviews in a span of one month. Only 1 hr before the third interview it was suddenly canceled and rescheduled, and in the last case, the interviewer did not turn up for the meeting at all! I notified and waited for more than 30 minutes before deciding not to proceed further. The video call was not on in any of the interviews. The overall experience was highly unprofessional.