It was suppose to be 2 hours. Received a detailed schedule from HR before coming in for the interview. First part was three part test of programming questions by myself. The second part was a panel interview with more questions asked in person. The third interview was suddenly canceled but I wasn't notified at all.

I applied for the position through my university job referral. I was contacted by the HR after one day of the referral for setting up an in-person interview, and it was scheduled one week later. When on the day of interview, I was at first brought by the hiring manager into a conference room to have a programming skills evaluation on a sheet of paper for 30 minutes, then he directly began face-to-face conversation with me, which was also 30 minutes. For the evaluation, the problems were not too hard. For the conversation, he asked me about programming questions at the majority of time, including the one I mentioned in the "Interview Questions" section which I thought was challenging, and at the rest of the time in the conversation he asked me some basic behavioral questions like "what do you know about our company", "why do you want this job", "tell me about your project experience", and so on. After the conversation, I was brought to take a tour of their office.