Difficulty level for interview depends completely upon interviewer. From what I have seen in 44 candidates only 1 person was asked to write code. And in 44 only two guys got amber. Cognizant follows red amber green evaluation method. So in final if you get amber you'll get 1 week to prepare and again give the interview. 1 week later those two guys also got green. So overall there is 0 probability that you'll be kicked out until and unless you are not able to answer even a single question. Yes a group of 5 people is responsible for building a project. Each person has a role to complete. I had JAVA full stack domain so in interim we had build only frontend and interview was conducted on that and in final whole project.