Looking for a developer php to refine the site

Good afternoon. Looking for a developer php to refine the site, there is a site with registration, a little filled with information. The theme of the project is a personnel agency. It turns out that each registered user has rights to all sections, you need to add so-say admin and 1 person with their rights, which do not have ordinary incoming users. Link to what is: z917882x.beget.tech/