I applied online. My phone interview was scheduled in a week. The interviewer was nice and willing to help. He asked me some simple data structure questions (e.g. explaining a situation and asking what data structure to use? why? what if the problem changes to this new problem? etc.) I was informed that they'd like me to go for an on-site interview which was scheduled for the week after. Again, I was asked data structure questions, slightly more difficult than the phone interview. I answered all. Then there was an OS question to which I did not give a complete answer. Although everything was fine before that question, one of the interviewers became impolite and did not even listen to my answer and tried to push me to the direction he wanted. I understand that he was suggesting the optimum response, but at that moment the best I could do was giving a partially correct answer with my knowledge. A few days later I was informed that my application was rejected.