I believe unless your Institute is an IIT or Reputed Institutions like IISc Bangalore, you wont really have good prospects and placements after a M.Tech in either Genetic Engineering or Biotechnology. Of course at IITs, IISc you do have recruiters like Biocon, Bharat Biotech, TCS Innovation, Biogene, Dr Reddys and many others.

Most of the students after M.Tech, hence pursue a Ph.D in Biotechnology and you should plan that, followed by a career in Research or Academia.