[review] Welcoming to experienced Django developers?

User story: I am an experienced Django developer. I want to easily understand the codebase, so that I can start contributing quickly.

User story: I am less experienced developer. I expect the codebase to use well known conventions, or document peculiarities when this is not the case, so that I can easily look up anything I don't understand.

I'd appreciate a quick review of the codebase, highlighting any issues that a Django developer would not understand or dislike.