The way I higher anyone is to find people who already do amazing work, approach them for advice on my projects, see if their a fit for our team and skills - then over time (as I work on a project with them) convince them that our company is the best opportunity they have.

So, back to your questions - where do I find high quality UX designers? We'll, here's a few places I look:
- www.dribbble.com
- http://www.behance.net/
- http://www.deviantart.com/
- http://carbonmade.com/

I also like searching on Twitter for bio's with UX design and high influence score, or follower count Ex: https://followerwonk.com/bio/?q=UX%20designer&s=social_authority

If you follow this approach for sourcing great candidates, and my recommendation above re: get advice/start a conversation - then work on a simple project first to see if there's a fit, you should find some success.

It takes time, but the right person can 10x your growth .. so slow down and do it right.

P.S. I also did this once, and ended up higher 2 AMAZING guys!
http://www.danmartell.com/why-i-would-pay-100000-for-an-amazing-ui-designer/

When looking for a high quality UX designer please note that a UX designer is not necessarily a UI designer and vice versa. Some designer are both, like myself, or they might specialize. Dribble has awesome designers but don't always show the UX process that went into the design. Try looking at UX specific sites such as http://uxmag.com/ or LinkedIn groups.
Be sure to ask UX designers about their process and samples, such as user stories, case flows, wireframes, architecture etc. You need more than just a great design, it needs to be structured to meet your business goals and show results.

For example, a client that had a great looking site asked me to review the site UX and find out why their user retention and sales were low. After evaluating the site I discovered that the shopping cart was a one way path and customers had no way to purchase other items or return to the site. Just adding incentives and a clear return path greatly increased their sales.

I have been hired to define the UX and architecture for a site or app, and then pass on, or collaborate with UI designer. I have also just created the UI, working with a client's UX team. But i also do all parts of the process depending on the project. Hope this helps!
Please contact me if you have any other questions.
Duncan

Linked in or ask around

Well You can search on various freelancing sites like Fiverr, People Per Hour or Upwork but I would like to suggest you that if you want a good, quality and attractive design website then hire a good UI designing who will take care of both quality and responsiveness.

WebClues Infotech is leading user experience design company that serves global clients and can be your perfect partner in setting up a distinct KPI for you as per as UI designing, user research and UX process goes.

Website link: http://www.webcluesinfotech.com/