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I am Magento certified(http://www.magentocommerce.com/certification/directory/dev/1556633/) and Expert in Magento Coding, Magento Extension making, Customization , Theme integration, Payment Api, Ajax, Javascript, Jquery, Prototype and Responsive css.
I am working on 40 hours in a week. Generally I take some upfront from the client it depend upon the client. I use Gmail and Skype chat for the communications.