I have a couple of readymade scripts/softwares with me for client management and invoicing. I need someone who can customize either one of it according to my needs. If this is something you find tougher than I am also open to developing a secure client management system on CAKE PHP as long as it fits in my budget. I have Cake PHP installed on my server.

Although anyone with a substantial experience and exposure in PHP can easily handle this but if you have some kind of experience dealing with audios and interested in creating audio widgets, I may have a couple of goodies reserved for you as well.