For off campus placements, you have to go to the career section of the companies in the website and register. Send your resume as per the requirements of the company. Some of the top Indian software companies are Tata Consultancy Services, Wipro Limited, Infosys Technologies Limited, Tech Mahindra, HCL Technologies, etc. There are many IT companies in Hyderabad. Some are Accenture Services Pvt Ltd, Acumen Software Technologies Ltd, Oracle India Pvt Ltds, Google Online India Pvt Ltd, etc.