OpenCart 1.5.1.3 - Page Speed Optimization and WC3 Validator

We need someone that is familiar with Google Page Speed,Yslow and wc3 validator to fix our ecommerce site. Contractor have to check, audit and config following items (as recommended by Yslow): 1. Host Assets (css / images / scripts) on different cookie-free domain/sub-domains (but Reduce DNS Lookups); 2. Minimize HTTP Requests; 3. Use Cookie-free Domains for Components 4. Reduce Cookie Size; 5. Minify JavaScript and CSS and make JavaScript and CSS External; 6. Place Scripts at the Bottom of the Page (if possible); 7. Reduce Filters, 8. Check Ban Expressions, 9. Check and remove Redirects; 10. Minimize DOM Access; 11. Check and update Smart Event Handlers for scripts; 12. Make Ajax Cache-able; 13. Don't Scale Images in HTML (Check & Update); 14. Avoid CSS Expressions; 15. Pre-load/ Post-load Components; and more... It will be Contractor's responsibility to config website and/or server (if required) according to make above changes in the website.