I know of two so far:<p>- iCracked (http://www.themuse.com/jobs/icracked/full-stack-backend-developer)<p>- interstateapp (http://blog.interstateapp.com/post/10699086100/the-fuel-of-interstate-one-year-later)
As much of a "bad wrap" that PHP has - you can still build a modern, functional app with it. You might not be able to move as quickly as with say Node these days - but it can be built. Although, knowing Rails, Php, Node, and a few others very well - I would spend the few weeks to teach the team node. The productivity saved down the road would be immense (I say this from having started a few tech startups 1php, 2rails, 1node)