The first giant warning sign is family running the business. The only time I've ever seen that work out well is Mattermark (nb: I don't work there, but heard it's a good place). I have seen it work terribly at multiple places.
The next trick is to just write all the glassdoor reviews yourself. See, eg, healthtap.
The next trick is to just write all the glassdoor reviews yourself. See, eg, healthtap.