Applied online and got an email on the same day to schedule an interview, chose the next available time slot (nearly 1 week after the email). Then, on the morning of the interview date got a cancelation notice that the position has been filled. Highly unprofessional.

HR interviewer was quite friendly although didn't know much about the exact responsibilities of the person they were looking for. Then they sent a task which I completed easily. I waited for 3 weeks and didn't get any feedback and decided to contact them myself and ask for an update. The HR girl wrote me that the headcount was filled by an internal transfer. Well, even in such cases, I should have been contacted and informed accordingly.