I've had good experience doing UX first when your team is writing the whole stack. It's much easier to establish the scope of a project when you map out the use

I've had good experience doing UX first when your team is writing the whole stack. It's much easier to establish the scope of a project when you map out the user's context first; the whole team then has a good idea of what needs to be accomplished. If it's done in isolation though, there in lies the path to madness =)