The structure can be written in a JSON or XML format or alternatively be constructed using one of our libs, which are planned to be written in D, Python, Java, Ruby, PHP and possibly/almost certainly others.
We generate client & server side code and you can get the source code out in one of the supported stacks. Alternatively, we can host for you on a scalable stack, so you wouldn't need to care about setting up your own environments. If you deploy on your own stack, you obviously can have full control, if you deploy with us, we'll provide a number of configuration options, but generally it's a compiled server app running on a auto-scaling stack.