We currently have 1st tier clients for .NET, JVM, Python, Go, C++ and Node.JS. There are also 2nd tier clients for Ruby, PHP, R and a bunch of other environments.
We want to build a fully fledged client for RavenDB for PHP customers and I have had great success in the past in reaching awesome talent through this blog.
The project will involve building the RavenDB client for PHP, documenting it as well as building a small sample app or two.
If you are interested or know someone who would be, I would very happy if you can send us details to email@example.com.