I got an interview through one and wound up spending an entire weekend frantically working through their "assessment project" only to be told on Monday morning

I got an interview through one and wound up spending an entire weekend frantically working through their "assessment project" only to be told on Monday morning that they hired someone else, before even looking at my work. I don't blame HN for this, just sharing my experience. Not sure whether I'd be willing to do assessment projects in the future.