hello,
I have a great deal of experience with PHP and MySQL. Ajax, not so much, but I can work that as I go ;) . As most of my stuff is php/MySQL, it's really hard to give any demonstrable work, though if you'll look at my profile, you'll see a few images of my monitoring app and a few other things.
The amount of time per week is just a placeholder. If you need more, then you'll get more, and probably a lower per hour bid. I'm not trying to be greedy, just trying to keep myself alive while I do the work that I love to do.
If you'll look at my profile (https://www.freelancer.com/u/twhiting9275.html), you'll see 100% positive (5 star) feedback, high completion (I don't abandon projects, but there are times employers take work and cancel to avoid paying) and a link to my own site where I've done the same for better than 10 years now. Your project will be completed with the same diligence and persistence. Your task will be completed within the advertised period of time, and be given everything needed to be done right.
I look forward to hearing from you and working with you on this project.
Tom Whiting