I applied through an employee referral. The process took 4 weeks. I interviewed at Persistent Systems (Pune) in Aug 2018
Interview
There were one telephonic and one face to face. Both rounds were tough though. You should have a strong foundation in whatever skills/technologies you are mentioning. In my case, since my fundamentals were clear, the interview went from basic to pretty deep. The telephonic round was about 40 minutes and face to face was about 50 minutes. Prepare your resume extremely well.
Questions on deep learning (CNN), machine learning (SVM, Kernel), NLP (stemming, lemmatization, word2vec, glove) plus other questions related to the research work.