Sharia does not forbid men and women from working together.

However, men and women should not sit together for idle chitchat or flirting. Islamic shariah obliges men to lower their gaze and not to stare at women. It forbids men and women who are non related to be alone together.

The part about the men and women who are non-related to being alone together has been legally enforced in a few situations here. It's all hush hush, when it's enforced and usually not on westerners. But, the law is the law.

Of course, this is just information gathered from my 25 years over here. I can't claim to be 100% sure about these. Probably, bleu or genesis or some others could clarify these for us.