The thing is, if you're not a programmer, you'll have a hard time judging the quality of a programmer and may end up hiring incompetent one. Even a newbie freelancer like me have seen it happen quite frequently. I often hired to clean up the mess left by those bad hires (almost all of them was hired by non-programmer).

You should try posting the job on curated/specialised marketplace such as http://getlambda.com/ and http://gun.io/ . Your chance of hiring great programmer will be higher there.