I've led 4 businesses through transitions to larger scale. When I start, I focus on solving bottlenecks to delivering new value. I optimize the performance of the front end, back end, and the development process. Then I continue by separating mission-critical portions of the software that must remain stable from portions that must change to respond to the market. I co-authored the book "Component-Based Rails Applications" with Stephan Hagemann of Pivotal Software, contributing a case study on my work with HookFeed and Churn Buster.Describe the most impressive thing you've done.