Customized PHP My SQL changes required to existing project

We are looking for a developer with strong php, mysql experience. Our current developer is moving into another field of work and we therefore require someone to take over. The site has a front and back end functionality that allows users to order, book & pay online directly without the need to speak with an operator. It is designed specifically for a service based industry that has specific requirements and complex logic for stock selection. The backend dashboard incorporates customer & staff databases, job management & scheduling, import / export functionality & sales reporting. The frontend interface allows end users (with different levels of access) to follow some prompts which guide them towards the right product choice and price (much like [login to view URL] but for a different industry). Users can then choose to save their order as a quote or continue through with an online booking & payment. The next steps required in this project include - 1. the addition of graphics to the front end system, ensuring the functionality of the system is not impacted (screen mock ups to be supplied). Graphics need to link back to products within mysql datatbase. 2. Three additional modules for additional products to front end system (screen mock ups to be supplied). 3. Some changes to existing page designs & functionality. Confidentiality is a must. Please demonstrate experience in this field by sending examples of previous work. A more comprehensive brief will then follow to shortlist of developers. As the project manager I know how I want the system to work I expect you to know how to do it. (my knowledge of php mysql is limited). Ongoing work for the right applicant. Confidentiality is a must. Please demonstrate experience in this field by sending examples of previous work. A more comprehensive brief will then follow to shortlist of developers.