Hello Tanaz Ahmed, 
As you have completed the graduation (B.Tech), now you are eligible to appear in various government exams. The Government of India recruits many of aspirants and job seekers for the vacant posts in government departments. 
Following are the sectors in which you can apply now: 
Engineering
Bank 
Railway 
UPSC 
SSC CGL.
There are also other career opportunities for you. Go to the official website of these above-mentioned departments to get the official notification.

Hope this helps.

Thank you and all the best.