Luckily we have Gabor on our team, and he is the kind of rock-star player who is in the top 1% of hackers and top 5% of designers. We use a great design firm to fill the gaps (www.vestaldesign.com). We use the design firm when we can't afford spending internal Xobni team member resources on design or when we need an outside perspective on our UI.

In my experience, it is incredibly valuable to use a designer with some coding experience. They appreciate the limitations of the medium.