I'd really like to hear about your process in choosing technologies to use. Also about how you accomplished all of this with such a small team.
If you can: Talk about the learning curve. Coming from a non-cs background. How did you pick up all these things? If not this talk, would love to see you blog about this.
Would love to see you guys talk about handling high volume, long running requests. Especially if you're using NodeJS for it.