Of course you can always just make a listing on LinkedIn or Indeed or GlassDoor like everyone else.  And you might get a great candidate, or you might hear nothing but crickets.  

I've heard from several clients and others who are having trouble with this.  So, my response is to think about hiring great people as a marketing campaign. - 

Like any good campaign, you have a list, an offer, and a presentation. 

In a nutshell -  

List - Don’t look for unicorns.  If you're not getting any good candidates, try scaling back your requirements - you may be looking for too many incompatible skills and attributes.  

Offer - What can you offer that no one else can? How can you make your job post stand out from the others in your category? 

Presentation - Put your offer where your ideal candidate will see it.  Don't just rely on the job sites - take out an ad or post in social groups where your ideal candidate is likely to spend time.