1) You need to talk to a lawyer (don't have any Bay Area references, sorry) 2) Don't pay them until you talk to a lawyer. 3) At-will is at-will and businesses

1) You need to talk to a lawyer (don't have any Bay Area references, sorry) 2) Don't pay them until you talk to a lawyer. 3) At-will is at-will and businesses are the ones who pushed for this concept, so don't lose any sleep over exercising your right to quit at-will (though I do think it is good professional behavior to give 2 weeks notice, especially if it will help wrap up any loose ends). The timing will always be unfortunate if the company sees you as a high-value contributing employee.