I'm an iOS Engineer, previously working at Apple on the System Experience Performance team.
I’m currently taking a break, but while I was there I re-wrote a bunch of the internals of AutoLayout to make it significantly faster, helped on various SpringBoard features, and wrote patches for every framework from Foundation to UIKit to reduce dropped frames and wasted memory across Apple’s platforms.
Before going to Apple, I wrote tutorials for raywenderlich.com and worked at a company called Fyusion.
If you want to talk, hit me up!