Interviewer is nice and pleasant to talk to. The questions include string manipulation like how do you build a christmas tree using hashes and some sorting question. There is a question whereby i have to derive the amplitude and frequency of the wave from its equation. The interview format is self introduction and explain your projects for about 5 to 10 minutes, then the technical questions for 20-30 minutes. Then the interviewer spent the last 30 minutes talking about the job description and ask if i have any questions.