I usually tell interviewers I don't do per-interview assignments. I'll often e-mail them a list of current open source taks I'm working on, a paragraph with goo

I usually tell interviewers I don't do per-interview assignments. I'll often e-mail them a list of current open source taks I'm working on, a paragraph with good requirements or a linked issue from an issue tracker. I'll list the programing language and framework and ask them to select from the list. I'll complete my task, with tests, and do a full presentation. Universally I get turned down. "You have to do our assignment." Oh and I'll usually offer to do their assignment for $300. That doesn't go well either. Only one company took me up on this offer, and it's the one I work for. (They didn't even ask me to complete one of my tasks, they just looked at the project I authored and said that was fine; and scheduled a full interview). The few times I have actually done these assignments, I've never gotten the job.