Good day!!!
I have read all the requirements you wrote, and I can confidently say that I can manage all the points.
I am a high-skilled system administrator. For the last 10 years I have been working as Senior System Administrator in HSP (Hosting Service Provider). As a result for this period I have managed more than 200 servers. Therefore, I have a great experience in Debugging and Resolving issues, Optimizing websites and server.
Except fixing bugs I support Magento websites on an ongoing basis, Develop and Implement new functionality.
Also I have good skills and work experience with PHP/MySql, Drupal, Joomla, Wordpress. I easily deal with Ubuntu, Linux, Apache, MySQL, PHP, HTML5, CSS3, Bootstrap, JavaScript, JQuery, XML etc.
Awaitng for your reply, and I hope our cooperation will be useful for both of us.