If you perform well in your IIT and do projects and other coding skills then you can get offer from Microsoft and Google but you need to maintain and minimum cutoff most likely 8 CPI to be get shortlisted for the written test once the test is over you need to be not the shortlisted candidate based on your coding skills you can qualify the east and once you qualify the taste you will be asked for interview at the time of interview if your performance is very well then no one will look at your background that is your graduation degree.