Hire people who are insanely passionate about your product

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According to Agarwal, "The people who work at Apple really really want to be at Apple."

"I, personally,... am an apple fanboy, and that’s OK. That's not a bad thing!" he says. "I'm gonna work twice as hard [for this company] because I've believed in it my whole life."

That enthusiasm is a key element of the hiring process—management looks for people who are really passionate about the company, its products, and its overall style and mission.

Agarwal has taken that mindset with him to Posterous: "Everyone [we hire] says, 'We love the product, this is what we want to work on.'"