What the hell is "design?" Is it gradients and drop shadows on buttons? Is it the font you use in your app? Is it how you organize your living room?
There's design in all these things but this is not design, per se.
Developers sometimes define "design" as "how it looks." But the features you choose to build and even the specific way in which you actually build it is all a part of design. You're a designer too.
Great developers are able to understand the "why" behind designers' decisions. Conversely, great designers are builders themselves who realize what's feasible and impossible with the materials and technology. There's smooth interplay between the two disciplines on the best teams. They share an equal responsibility for the final user experience.
In my talk I'll discuss some ways to tear down the physical and metaphorical wall that sometimes exists between designers and developers. When you empathize with designers on your team, you'll quickly be amazed how you both start building better products together.