This is exactly what I did when I met my co-founders. I actually flew out to London (from Portland) to work with them for a week. We worked on some random proje

This is exactly what I did when I met my co-founders. I actually flew out to London (from Portland) to work with them for a week. We worked on some random projects and did one all nighter. I think its a great way of quickly testing whether someone is a fit or not. Actually, some of my friends do this at their company for potential employees as well. After deciding they probably want to hire a candidate, they fly them out (if they are not local), pay them consulting fees to work for a week, and if it works out then they hire them.