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He said that they had 2 engineers in 2010, 3 engineers in 2011, and 5 engineers 2012, but only 2.5 backend engineers.

I'm surprised that the number of engineers is so low, considering that they had 15 employees.

Maybe the figures above don't include mobile engineers? But then what would the other 2.5 be doing?

Thanks to Instagram and AirBnb for putting this on. It was an amazing event.

I think he's only counting engineers working on the back-end and not those who are working on the iPhone and Android apps.

No he was counting all of us :)

You guys are nuts!

Probably all were doing a little bit here and there but only two were hired 100% for that purpose. 13 person team with 30 million users...amazing!

(Amazon and cloud are the unsung heroes.)