Wasn't JRuby an option? Anyway, obviously Ruby (or any other dynamic language for that matter) isn't the solution to every problem. I was once tasked to refurb

Wasn't JRuby an option? Anyway, obviously Ruby (or any other dynamic language for that matter) isn't the solution to every problem. I was once tasked to refurbish an old Delphi desktop application that did some thermal simulations; I wrote the interface as a Rails webapp and the simulation itself as a compiled C routine, which I called from Rails via FFI.