So, most of what I do is optimizing the graphics stack on Boot2Gecko (Mozilla's new mobile OS). That ranges from coming up with new techniques to offload work to the GPU to digging deep into code to find slow portions and optimize them until my fingers bleed. As for how I got it, a friend on the team prodded me and told me about the project, and during the interview process they found out that I had fairly deep knowledge of graphics optimization, and it just went from there.
