Its like, here are 5 dozen requirements for the position no human alive currently possesses, now let us talk about everything EXCEPT code.
I'd just say "you want to work for X doing Y using Z? Show us some code samples of what you have done in the past".
And I would hope it would not always be "show us code samples using this tech for what we are trying to do" because then I already wrote your back end for you, apparently. I have a good ~30k lines of code I have written in college for both courses and freelance, and it all seems to sit in a folder of stuff I have since nobody ever wants code samples.
There is the flip side, that people could copy paste someone elses work to try to claim as their own code to get a foot in the door. Dunno how to deal with that. Maybe just ask for some 1 day assignment. If you are a web company, have them build a simple table in django using some database. Or something just to show they know what you are talking about.
But the rapid fire graph search and various sorting implementation questions and how do you use insert X random algorithm in convoluted way Y to achieve random result Z drive me crazy.