The process was very Comprehensive and thorough. Included detailed conversations. There was also an assignment that has to be submitted. But this was years ago. Hope the situation is similar currently as well.
I applied through an employee referral. The process took 2 weeks. I interviewed at Indian Grameen Services (South Twenty Four Parganas) in Oct 2020
Interview
The process started with two hours of written test comprised of technical questions, quantitative, English and general awareness section. It was followed by interview session of one hour and then document verification.