As you asking for the job opportunities after completing your engineering from the computer science you may apply in the following public organizations that are

DRDO - Defence R&D Organisation
ECIL - Electronics Corporation of India Limited
CBI - Central Bureau of Investigation
IB - Intelligence Bureau
NIA - National Investigation Agency
ISRO - Indian Space Research Organization
CDAC- Center for Development of Advance Computing
NPCC - National Projects Construction Corporation Limited
BHEL - Bharat Electronics Limited
SAIL - Steel Authority of India Limited
NIC - National Informatics Center

Other government jobs :

BANK Jobs.
Railways Jobs.
IAS
IPS
DEfence Services
BSNL jobs etc......

if you have a good Academic score then you may also apply in the higher mncs that are as follow:

1.wipro.

2.microsoft.

3.accenture.

4.infosys.

5.honeywell.

6.cognizent technologies.

7.tata consultants.

8.mahindra satyam.

9.ibm.

10.oracle.

11.convergies.

12.yahoo.

13.google.