You are far better off using your network, if you don't have a network to reach out and find a key technical person find out if someone else you know does. If you would like to take it offline you can email me, I help a lot of organizations find that key technical person, I don't do it as a service it's more for the karma and to promote my business should a company ever need my services.
linkedin works pretty well = search for the skill set you need, and it will show you connections that are close to you - then you can get a reference from your direct connections who know them. That's been the most effective way I've found.
You are far better off using your network, if you don't have a network to reach out and find a key technical person find out if someone else you know does. If you would like to take it offline you can email me, I help a lot of organizations find that key technical person, I don't do it as a service it's more for the karma and to promote my business should a company ever need my services.