Written in a common programming language that many developers understand and which has a bright future ahead of it. Python, of course!
Not to be a complete downer, there are some good ideas which this project has, but I am really skeptical if Python is a good choice for this kind of application. Especally if it has to run on servers.
Just out of curiosity, do you have a source for your claims that Nintendo has a bad work environment?
I'd love to learn more about it and verify this claim.