Music Site updates/improvements (ongoing work possible)

Hi, I am part of a new website selling royalty free music for video. Are website is finished but we still need a lot of improvements. It is focused on a music player from Jplayer. We have been working with a coder for sometime but now we are looking for someone more reliable and trustworthy to have a long working partnership. We need you to have good knowledge of: PHP, SQL, Javascript, Jquery, CSS, HTML, Ajax We are looking for someone to work with us as an ongoing tech for the site fixing bugs and making updates when need. I will give the following tasks to begin with to see how each coder does. I will then choose the coder that seems most professional and capable. Tasks are: 1 - Add coupon system in CMS 2 - Update cart design and add coupon input 3 - Improve music streaming speed (slow on ios and I.e) 3 - Small css fixes on page Since this is an going job we need someone who works with a fair price for continuous work. Please let me know: - What skills you offer - Estimated turnaround time for tasks - Pricing structure - Any examples of work Looking forward to hearing from you. Best, Gareth