OP, I'm really sorry you are in this boat. My honest opinion is that this is a bullshit charge you are forced to carry around, I wish you the best and hope you find an employer who agrees. It is unfortunately the case that the US grossly over-criminalizes people and has no real way of offering them a shot at atonement. I personally do not understand what is gained by making a huge permanent underclass, but this country seems to believe this is justice in some perverted sense. Even if your charge wasn't bullshit, I would still wish you the chance to get it expunged or made right in some way.
That said, I think in the current environment you should be quiet and ride it out. Let the company get to know you and make a decision if possible. If they love you and then find out, you will have a better chance than by poisoning the well up front. IANAL, just a dev who has dealt with HR a few times. Best of luck:)