Check and Optimize PHP code and MySQL DB

Project Description:
Hi,

We need a professional Web Developer who can check out some code lines and optimize it.

The Code is about search in PHP , connected with a MySQL Database.

You need to do the following
1- Check the search functionality.
2- Optimize the code to work perfectly.
3- Make Sure that the Database is optimized.
4- Make sure that the search will not collapse with huge number of requests.
5- Recommend Good server configuration for best performance.

Please make sure that you can work with PHP, MySQL, Ajax, Javascript ,

Please don't bid if this is your 1st project .

Regards