There are lots of cons which I cannot describe in words.
1) they can fire you any time without any notice period.
2) HR will always manipulate you every time you discuss your problem with them.
3) TL or PM or no one will help you in project. If you are not able to handle the project, you will be fired.
4) Employees are treated as servant. even you have less values then a Guard.
5) Alternate sat is off and very less leave. They provide only six paid leaves in a year.
6) Very much tax deduction as compare to other companies.
7) operations are very poor. (stinking Washrooms, not pure Drinking water, no working ACs... all these are issues). Still they are using some CRT with blurring interface.
8) TL and PM always tries to make fool to his client.
9) Very much work pressure. You will have to stay whole night several times.
10) Very small projects exists in this company. you can be moved from one project to another in a month even.
11) They will not ask you before changing your technology. You will be moved from one to other technology without any prior training or notice .