Maintain and Fix Wordpress Websites (Custom sites) -- 6

We have a couple of Wordpress websites that we use and maintain. I need a developer who is very good in troubleshooting Wordpress issues as they come about. Fix issues on time and within budget. I need someone who can turn things around very fast. Requirements: Must be EXPERT in understanding and troubleshooting custom code. All our Wordpress websites are all custom made with custom plugins, software, 3rd part integration, etc. - Maintain multiple WP websites (all different themes and some are custom code) - Visual composer - Very familiar in using ACF for Wordpress - Fix plugin issues - Fix incompatibility issues - Upgrade WP to latest version without breaking any site functionality - Back up and restore - Protect from malware and hacks I am looking for someone who I can work on a per hour basis. This is a per hour basis work. Looking for someone who can provide competitive hourly rate. This is long term work. We have over 10+ websites that needs maintenance when needed. Speedy response is needed.