The interview started on time and ended on time. Interviewer was a nice person. This looks like a great company to work at. Their product looks very polished and very useful. The scale they handle also looks to be huge. I attended only the first round which was PS DS round. Could solve the first problem with O(n^2), optimize it to nlogn and then with a little help from the interviewer, O(n). I failed shamefully at reversing a linked list. Although it's something I have done before, just went completely blank during the interview and could solve immediately after the interview. So I suggest everyone to brush up even the simple topics.