Required for core functionality such as security, network management, and accessibility. These cannot be disabled.
A frontend developer focuses entirely on the layer your users see and touch: the UI, the interactions, the performance of that interface in the browser. A full-stack developer splits time between that and the server, database, and API layer. If your roadmap is UI-heavy (a redesign, a new design system, a performance overhaul), a dedicated frontend developer moves faster than someone splitting attention across the stack.