Thank you. I already watched the presentation, but couldn't find any open job positions in regards to Racket. I'll try to contact them directly and will see if I have some luck.
They are using an in-house variant of Scheme known as DC. There are a few pages about it in Game Engine Architecture, a book written by an engineer at Naughty Dog. https://www.gameenginebook.com/
DC is compiled to bytecode then interpreted. DC compiler is written in Racket.
