Wordpress optimisation

Hi, I have a wordpress site that needs optimizing. It is already running through a CDN network, and has various caching plugins that speed it up. The main issues are: Errors in the code Javascript Errors Ajax Errors Unused CSS & HTML WC3 errors Plugin errors I need a wordpress developer with understanding of Javascript, php and ajax who can scan through the site and eliminate the errors, ensuring all the wordpress plugins work effectively and that our Ajax information box is fast and operates smoothly. We need the site stripped of all code that is not being used, and streamlined to work quickly and efficiently. If the job is done well, to our expectations, you will be rewarded with more work from us, as we are constantly in need of updates. Do message me previous sites you have worked on and your skills etc.