Hey Karthick, there are a lot of career options after M.Tech including teaching at some Engineering college or working for any IT firm. But apart from these, you can also go for any Phd program as you have experience with research.
You can also apply for some govt. organizations like BHEL or ISRO or BARC or any other research based organizations for Junior or Senior Researcher role or Scientist role. You can also work in good IT or your specific domain- related companies.