After completing B. Tech in Electronics and Communication you are eligible for the both private and government jobs. For government job, you need to crack the entrance examination of one of following government organizations:

Indian Telecom Sector
BSNL
MTNL
Post and Telegraph Department
Defense
All India Radio
Civil Aviation Department
National Physical Laboratory
Bharat Electronics Limited
Oil and Natural Gas Corporation Ltd (ONGC)
Bharath Electricals limited
Steel Authority of India Limited
Banking Sector
Air force etc