Webdesigner gezocht voor Look and Feel for Application

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We need a designer that will determine the look and feel of our application. Site is pure HTML5 and css3.
We already have the backend and javascripts done...just need someone with good taste to enhance user experience.

Further information
I have several companies ...all in application development and interfaces.
We are a SaaS ( Software as a service ) provider.
One of my companies is a management company and has been 10 years in the Dutch market as niche product for companies or resellers (MKB) to manage the verzuim process.
My new company is a interface company that makes dynamic user initiated interfaces with different applications (apps). We have developed an integration server that allows users to set up their own interfaces between applications of choice in minutes.
The backend of this interface has been in production for a long time. We have built a front end interface ( pure HTML5/css) that is the user interface so clients can:
1. Create and manage a workbee account
2. Select and app
3. for source Start and manage an integration to a destination app.
4. Monitor the process /review logs etc.
The functionality of this interface is done.
We use webservices ( JSON, XML (SOAP) to communicate between the backend and the frontend...so the javascript library that calls the services and responds to users inputs has been done a long time.

Job:
Problem is the interface could look better with a designer focused on how the user will experience the application. Of course its OK..but I am a perfectionist and want it to be pixel perfect.
If you have a perfect designer that knows all adobe products and can make a perfect PSD.....we still need someone to convert that to HTML5/css3 so its quick and clean code that will work on all devices.

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