I applied on their website. In two weeks, I got an invitation to OA test in python on Hackerank. There were 5 questions in 120 minutes. You need to know some algorithms such as shortest-path.

There was two rounds of aptitude test. There were lots of questions and a timer to identify the speed and accuracy of the interviewer. After clearing those two rounds, the third round was the call where the interviewer asked probability related question, after which I was rejected.