Need a Magento Developer to help me in my project

hello . i need a talented and trustful magento developer to help me in my project . my client is facing issues with his site . he is facing the following problems. Uploading files on there uploading system, like FTP, Ai, pass etc, is very glitchy. We need to know why or how. Whether is magenta system they used, programming, bad steps as far as putting it together and over all approach and design. Speed performance and over all function. Performance in all Browser Multi-device use order smoothness, is terrible in my option. more details ll be provided in chat . please only reliable and intelligent developer (individual only ) can bid . not a company . thanks