The IT sector is facing unprecedented talent crunch as attrition rate has becomes one of the biggest concerns for companies. And New Jersey-based IT firm Cognizant Technology Solutions has been the worst hit. The software services exporter, which employs over 3 lakh people globally, witnessed the highest attrition rate in the industry. On a trailing 12-month basis, Cognizant clocked an attrition rate of 33 during the September quarter this year.