The HR is very nice, and set the interview with interviewer. This is the worst interview I ever had. I have been interviewed with the first-class companies, such as google, apple. But this interviewer seems to be very rude and despise to interviewee. When I asked questions, the interviewer started to laugh at me??! I did not understand, the interview should be serious and based on mutual respect. This is the worst interview I have ever had. Wolfram research created an amazing products. It is hard to believe the interviewer are so rule and impolite. Obviously，I would never work with such person. I decided not continue the hire process.