Exactly. Also you have no idea what kind of cultural fit you're having if you only rely on technical skill. And besides, why do you want me to solve $problem? Take a look at my portfolio and public code - it's telling enough.
My employers don't want me open-sourcing the work I do for them, so this only works if you open-source your side projects.
I see a lot of comments here about how they would never waste their time on an exercise like this, but a small project for the purpose of an interview can probably be done in less time than any of your public projects.
