Tata Consultancy Services (TCS), Cognizant and Infosys have emerged as the top employers in the IT-BPO sector, according to a list of 20 leading companies released by industry body Nasscom."About 1.25 million, little more than the one-third of current workforce of IT and BPO employees were employed in these 20 firms during 2014-15 financial year," Nasscom president R Chandrashekhar said here on T...