Hello, I've read your project description and I understand that you're looking for someone to setup server on Amazon EC2. I've completed many projects similar to yours, please take a look at my profile. For this project, I'd suggest using Centos 6.x (for stability), PHP-FPM 5.6 (latest, which is fastest and has little bugs), MariaDB 5.5 (which is open source, and faster than MySQL 5.5).
My name is Duc Nguyen, and I'm a Web Developer with more than 5 years experience working with PHP, MySQL, nginx, etc. Also, I'm a fulltime freelancer so I can start the job right away, and right now I'm having 100% completion rate because I'm committed 100% to a single project at a time.
Hope to hear from you soon.
Best regards.