I applied through a staffing agency. The process took 1+ week. I interviewed at Cognizant (Chennai) in Feb 2019
Interview
It's was so neat and clear... HR conducted it very well. All rounds were completed on the same day. Salary discussed quickly. HR was very polite and explained me about company Limitations on salary limit
I applied through other source. The process took 4 weeks. I interviewed at Cognizant (Bengaluru) in Jan 2018
Interview
Three rounds, First round on hackerearth contains three basic DS questions on java. Second round was telephonic again on DS,multi threading and Java. Third round was video chat on Cognizant office, again on problem solving, multi threading and java.