SAP Fiori is the design system behind all SAP business applications, built to replace SAP's traditionally complex GUI screens with a clean, task-focused, consumer-grade experience across desktop and mobile.
Role-based access is a first-class design concept here, not merely a permissions feature bolted onto the backend, so interfaces are tailored to what a specific job function actually needs to see and do, relevant to any enterprise product designer solving the same problem.
Designers working on enterprise resource planning (ERP) or complex business-process software who need a proven case study in simplifying dense, role-specific workflows.
It's a modular, multi-technology system, components can be extended or modified per product, worth checking the specific technology binding (web, mobile) relevant to the target project.
SAP's official design system for consistent enterprise interfaces across web and mobile.