is after mbbs one can do the biotechnology engineer
I think you are talking about M.Tech in Biotechnology.So, yes you can M.Tech in Biotechnology because the basic eligibility criteria for MSc in Biotechnology is a bachelor's degree in any science stream.It can be MBBS, BAMS, BHMS, Nursing, etc. with at least 50% marks in graduation from a recognised University.
I hope this helps.
Yes you definitely can pursue biotechnology engineering after the completion of your MBBS course here it will be your advance Medical research side not only will be learning about medical biotechnology research but also you will be dealing with some more important topics in advance.
Best of luck.