Freelance software developer

I have a multi-tenanted ERP solution that was custom-built for me by a UK-based firm according to my specifications. To lessen my dependence on this original developer, I am looking to engage another party proficient in PHP, MySQL, Laravel, GIT, VUE, Bootstrap, Ionic, and Linux. The objective is to gain a comprehensive understanding of the existing codebase, assist with modifications, troubleshoot issues, and ultimately help in onboarding additional developers as we expand the team.