Approaching startups [India]

Hi, I recently got placed at OCI (Ppo from intern).
I'm satisfied with the offer but I have always wanted to work at a well funded startup from the base up(even if its for an intern position).
I'm aware that referrals don't work for interns.
Can someone help me out on how to go about applying for various startups like the ones mentioned below?
Blind tax(Oci offer details)
TC - 32 lpa (17.5 base+6 jb +40/4 stocks)
Yoe- 0
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