Seeking PHP/mySQL coder for long-term

We have three web databases and need an excellent PHP/MySql developer for long term, perodic hourly work on our custom, small-size DB applications. Did we say long term? Yes, we may not provide a heavy amount of hours, but are looking for a long-term relationship, not hit-and-run work. The projects are of low urgency, but we do expect responsive communication. Primary work will include: - Maintain/develop registration and CMS on all sites. - Develop/modify/redesign forms, including payment processing system (already functional on two sites). - Develop search and reporting functions for non-tech users. We expect documenting work before it is implemented in discussions with our team and them implementation and testing the funcyionality as documented. You must know how to code cleanly and parse from forms, how to integrate and work with secure payment APIs such as authorize.net. The site must perform data validation, be secure from cross site scripting and SQL injection attacks, log user activity, support robust and secure user management. Please send live samples of the work you have done (along with specifically what you did and didn't do) and any sample design documentation you have. Thank you we look forward to working with you.