PHP, HTML, Ajax code segements

I need an expert for php. I am modifying a browser software based on php. It is a small erp software. I need somebody who can helb me with this some work. I need a programmer who knows php very vell, has experience with php, Html, Ajax and Javascript and knows and uses basic programming style like object orientated application. First work: backend: class for article, diferrent function to upload and modify an article, function for new article number (moving on number), subclass for different main article with different data fields, database strukture (tables for article fields), function for print out of an lable, function to sort article in a menue structure frontend: formular with differerent input fields, some of them are neccessary fields (if not filled out then warning message pops up), upload function for images and pdf files for the product, ordered in tabs, Many small projects like this. For each project we clear things out and discuss timeframe. Fixed payment by hour. Payment only if we are satisfied. Thanks.