Hi,
My name is Angel Guzman Maeso. I have a server company with more than 1200 clients using Wordpress, Joomla, Drupal and others. I usually make the work as you describe for my webhosting clients as devops task.
Also, I am a computer sciences engineer freelancer. I have experience with PHP (8 years) and Python (5 years), server administration, migrating and refactoring backend source code with PHP and Python in other big companies in Spain.
I have background in Computer Science, Math, Physics and Statistics.
I use heavily OOP and I work very well with other team players if it is needed. You can see my github account "shakaran" for some of my public work published or my stackoverflow account.
Also you can see my linkedin profile "Angel Guzman Maeso" for the companies that I have worked and his recommendations. Let me know if you need additional info or some code defense to test my work.
I am offering a low bid, because I am starting my profile in this plataform, but if you google my name, you can see that I am a active programmer :)
If you hire me, you are hiring a A+++ person for this job. See the feedback client in my profile.
Regards
Ángel Guzmán Maeso