Yes, you can apply for the Jobs in Software Field after completing B. tech ECE, but it is mandatory to have knowledge of one of following languages:

C language
C++ language
java
.net
visual Basic
C sharp(c#)
PHP language
oracle

You can apply in following companies for the job:
patni computers
sapient
cognizant
HCL
Microsoft
IBM
Wipro
Intel
Dell
Google
Infosys
TCS
Tech Mahindra

As on 4 August 2014 following jobs are available for the ECE students in various fields:

Faculty - ECE School of Engineering (2 - 7 yrs)
Amrita university

Senior Design Engineer , FPGA (4 - 8 yrs)
Cerium Systems

Lead Verification Engineer / Senior Verification Engineer (3 - 8 yrs)
Cerium Systems

Electrical Component (2 - 5 yrs)
Geometric Ltd

Electrical Component (2 - 5 yrs)
Geometric Ltd