Multi-layer healthcare system architecture integrating mobile patient and doctor interfaces through an API Gateway with centralized authentication, patient management, and visit tracking. Data flows from the Mobile Application Layer through the API Gateway to specialized modules—Authentication Module, Patient Management Module, and Visit Management Module—which feed into a Record Processing Unit for document handling and metadata extraction. The Data Storage Layer persists structured patient records and medical files, while the AI Processing Layer applies OCR, context analysis, and summary generation to unstructured clinical documents. Security and Access Control Layer enforces encryption at rest, HTTPS/TLS transmission, role-based access control, and audit logging across all tiers. Fork this diagram on Diagrams.so to customize authentication flows, add cloud-specific services (AWS, Azure, GCP), or integrate additional clinical modules like appointment scheduling or prescription management.