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Imagine 3 lightning talks on each of the above topics, intermixed with open Q&A discussions.
Video
Slides
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AMA Questions
Are there any particular talking points or questions you'd like to ask me before I go? Go ahead and add them here to give me an idea of what I'm up against. 
Architecturally, what seemed like it was going to be great, but disappointed, and vice-versa, what gave unexpected benefits?
Tips and tricks for effecting change?
How did you approach scaling yourself as open edX grew?