[masudrhossain]

Well, some questions rise up for me.

Did you get the interview? If you got the interview, it might be how you interview with them. I'm a startup founder and i try to hire people I can go to the bar with and seems very talented.

What kind of startups are you applying to? If you're targeting startups who does not or never plans on selling to enterprise customers, then they might be denying you because of that.

If you're interviewing with them and they ask you questions, just remember that you have to answer in a manner of "We'll get that done in 1 hour, and not 10 hours like you would with enterprise". And jobs are mostly a numbers game. They could simply be using your enterprise experience as an excuse.