In my experience as a person who has been hired before, I can say that I would absolutely prefer well-factored, but rather concrete code over towering abstractions. Sure, if something is a general feature, it should be abstract. There's nothing more frustrating, though, than wading through layers of abstractions, only to find that hidden behind them is a singular concrete implementation.

You shouldn't optimize a personal project for your first hire. Do the simplest thing that works, and then abstract/iterate.