I was going to say that for an eCommerce hackathon, you probably don't need hardcore algo-hackers or mobile devs, but then I started to wonder what you could do

I was going to say that for an eCommerce hackathon, you probably don't need hardcore algo-hackers or mobile devs, but then I started to wonder what you could do with good web skills, data-mining/scraping, and a slick mobile experience with some of the API's it provies (geolocation, etc.). That would indeed be a pretty impressive hackathon, I think :)