I applied through college or university. The process took 2 days. I interviewed at Paytm in Aug 2015
Interview
Process round was consist of 1 selection written round consists of 20 questions mainly from c language and then there was 3 programming questions .After the shortlisting 3 technical and 1 HR round ,questions were mainly from some algorithms and project discussion .The level of difficulty was increasing in further rounds .
Interview questions [1]
Question 1
There was basic algorithms questions ,in second round there were some tough questions and discussion on your working project .