Do You have robot already?
Robots are not controlled by any language, they are normally controlled by microcontrollers, which execute specific comands to achieve whatever You want Your robot to achieve. On compile time language (C, Java, BASIC, etc) code is converted to ASM instructions which are run in uC.
Programming omniwheel bot is no different than programming any other robot or microcontroller controlled circuit in the world, so to answer Your question, yes, there are many people on this forum who have experience programming microcontrollers.
To be able to help, we have to know what microcontroller You are using and what specific task You want Your robot to do. Also, what hardware You use to make it move (stepper motors, brushed/brushless DC motors, servos, steam engine, etc, etc).