I watched an interview awhile back with the head of engineering at Pinterest (I believe he just departed). I remember him saying that one of the most difficult things about working at Pinterest was working with designers. I was honestly a bit shocked to hear that because Pinterest has such a thoughtful and beautiful design. Clearly there is a huge respect for good design at your company.

As a designer, what are the biggest challenges you face when working with engineers? And how do you overcome them?