Don't want to discourage you too much, but even non-contract employees in most states are subject to "at-will employment" that means they can fire you no reason at any time with few or no considerations. If your "frame of reference" is anywhere in the EU prepare to be shocked. A while back, I was asked to resign like 10 days before $40K of options vested. Talked to an employment attorney (a good one) and they said there is basically nothing you can do about it.