Full-Stack Developer for Secure Access Control & User Roles

I need an experienced full-stack developer to add secure role-based access control to my existing, fully functional website. The site has about 10 sections, including Shop, Podcast, Bookshop, News/Blog, Catering, and others... (Budget: $250 - $750 USD, Jobs: Animation, Backend Development, Frontend Development, Full Stack Development, Graphic Design, HTML, PHP, Web Development, Web Security, Website Design)