As you want to get the details of career or jobs after B.Tech. Electronic and Communication Engineering so here is the information of the same for you:

B.Tech. Electronic and Communication Engineering Employment Area
Indian Engineering Service (IES)
Indian Telephone Industries, BSNL / MTNL
Semiconductor, Chip Design-Industries (Motorola, IBM, HP, STM, Philips, IT etc)
Indian Oil Corporation Ltd. (HPCL / BPCL / IPCL)
Oil and Natural Gas Corporation Limited (ONGC)
Civil Aviation Department
Steel Authority of Indian Limited (SAIL)
Power Sector (NTPC / NHPC Ltd.)
Bharat Electronics Limited
Indian Railways
Indus tan Aeronautics Limited (ISRO)
Software Industries (ALL MNC’S) (HAL)
Teaching / Research
Government Sector

Private Sector Jobs:
It is possible for students to get jobs such as:

ASIC Design Engineer
ASIC Engineer Trainee
Business Analyst, IT
Developer
Jr. Embedded Engineer
Jr. Software Engineer (Trainee)
Network Support Engineer
Programmer
Software Engineer -.Net
Test / Quality Assurance (QA) Engineer (Computer Software)

Government Sector Jobs:
The fields where they can join are:

Civil services
Defense
Indian Railways
Indian Air Force and many more
BSNL
Doordarshan (Prasarbharthi), etc
VSSC/ISRO