Here some advice from Ryan Freitas

http://secondverse.tumblr.com/post/5840343627/so-you-want-to...

Here a couple of red flags to look out for. They are looking to be a billion dollar company. This is another way of saying that they have giant egos and unrealistic exit plans. Find the people that know the topography of the exit landscape and how they fit into it.

Business Development personel without a product: For most startups, its just too early to have a BizDev person around, unless partnerships are critical to the success of product

The CEO can't code

They have 1 Jr level designer to feed 6 engineers

Everyone uses Windows, including dev-ops. (run away)