I took two rounds of phone interviews before onsite. One was good the other was so so. Basic coding questions and algorithm/data structure questions. Some are related to big data operation. There are three rounds of onsite interviews. First interviewer asked four algorithm questions. I need to code two of them. None of them were very difficult, the interviewer was nice and willing to give hints. The second one was a design question about a chat application and several follow up questions on scalability. The third one again was a coding question, the interviewer came in and raised the question and started to work on his laptop. I came up with an idea and he brought up a counter case. I couldn't find a good solution after a while and asked for more hints. Finally I was able to finish the code but felt really bad. We remained silence for most of the time, the interviewer seemed busy with his own work. I would give a negative experience but the other interviews were quite nice. I'm not sure if the third guy was the bar raiser.