With over a decade of experience in web development and system administration, you can trust that I not only excel in Linux, but deeply understand its underlying mechanisms. I have successfully built numerous websites using different stacks including CentOS, exactly the OS you need for your project. Migrating large amounts of data like the 100 GB you estimate wouldn't pose any difficulties since I've done similar tasks before.
Moreover, my work extends to database management, an added advantage for your project's needs. I am well-versed with MySQL as well as other popular databases like MongoDB which also grant me more flexibility and expertise in data migration. Crucially, I fully appreciate and prioritize clear communication with clients during projects to ensure that their vision aligns with the end result.
Lastly, I'm an eager problem-solver by nature and adaptable to new technologies. With commendable skills in PHP 7.8 and 8.0 along with Linux System Administration, this project is perfectly suited to my capabilities. Accompanied with my efficient work ethic and commitment to client satisfaction, let me assure you that choosing me would guarantee a seamless transition of your data to your new CentOS server and a job well done.