I would at least put C# on the table for consideration though. But that's because I really like C# and have a bit of experience developing in Xamarin with it for both the CLR and mono, so I know the workflow and tech CAN work on linux. The quality of some stuff out there, like this http://www.codeproject.com/Articles/168662/Time-Period-Libra..., is phenomenal. The concurrency stuff is pretty solid as well. But it's a different ecosystem too and you get casualties like ServiceStack.