If you're looking to hire a good programmer, think of what good means to you and what specific skills your project needs and write them down. Writing "rockstar programmer wanted" is a hint that you can't even do that (instead you're pushing hype-speak), which sets off alarm bells. Also, at the end of the offer you can write something like: if this sounds interesting to you but you don't exactly fit the bill, you can still apply, but also attach an explanation why you're interested and why we should be interested in you.