Its been 2 years since i left cognizant but the company is very dear to my heart. I worked for application security assessments. I was fortunate to work in a team of supportive and knowledgeable people.
Pros: employee friendly policies, transport facility, support for higher studies and certifications, lots of resources available for knowledge upgradation, location transfer possible within INDIA as Cts has lots of branches all over india, good canteen facility. Good reward system
Cons: nothing comes to my mind. People who have been with the company for long Seem to be of good standard. If you get a good team of supportive people and projects of reasonable deadlines, you are lucky. Cts will make life enjoyable in such cases.
Personally i felt so much work stress in CTS so its one of the main reason i quit my job. But that depends on the projects, some projects provide work from home which is very rare. But as far as i know working environment is quite good.