Thanks all- btw I'm looking for stories from people who've been in similar situations. I want to settle this with soft skills first.

For more context: yes the goal is to sell it to said big tech company (or quit and raise VC). We have some traction but we want a lot more users so we can ask for more $$.

I don't think the company will make this a new product and make me VP. It's a risky bet and big tech doesn't move that fast.

Thanks for the "get a lawyer" advice- that's a clear course of action I know how to pursue. I'm looking for real stories of how other people have handled this w/o legal.

I think there are other options available and I want to understand them. Thanks!