While you are still there, reframe your thoughts. Is there some interesting CS problem you can solve within the context of that startup that would be applicabl

While you are still there, reframe your thoughts. Is there some interesting CS problem you can solve within the context of that startup that would be applicable to other industries? Do they allow open source? If they do you could always start something that benefits them but under your own git account. It benefits you in terms of marketing yourself and your skills.