Hi Mayank, generally the IT companies are being divided into two categories, one os product company and the other is service companies. 

Product Companies are companies, who recruit a less amount of students during placements. They give a lot of development projects and exposure to many different technologies. The package is also high because of the less recruitment, and they expect a lot from the students. They expect students to be strong in coding concepts (mainly OOPS, Data Structures) and also should be able to do full length coding in less span of time, with optimised coding logics. Some of the top product companies are Microsoft, Google, Oracle, Apple, HP etc. 

Service companies are companies which dont provide much of development projects and they service to most of the product companies. They give exposure to much of old concepts and support projects. Lucky are those who get themselves into development projects. But these companies are places where one if works hard can learn and prepare himself for product companies. Some of the top service companies in India are, Infosys, TCS, Wipro, HCL, Accenture, CTS, Capgemini, IBM. 

Hello Aspirant
.
Top It/ CSE companies in India for btech students with higher packages:
.

• Tata consultancy services
• Infosys
• Wipro
• HCl
• Cognizant
• IBM
• Microsoft
• Adobe
• Google
• Cisco
• Oracle
• Sun microsystems

.

• Job profiles:
  
•                       The job profiles or the designation offered by various top recruiters including the following.
  
• Computer programmer
  
• System analyst
• Software developer
• Web developer
• Programmer etc

If you have any questions further let me know.
Thank you!!!

Hello Mayank. Thank you for choosing Careers360.

Here is a list of top CS/IT companies in India : 

TCS

Infosys

Wipro

Oracle

Facebook

Google

Hawlett Packard

Cognizant technology Solutions

IBM India

HCl technologies

HCL infosystems

Ingram Micro India

Redington, India

Hope this helps!

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