Five-layer client-side data flow architecture separating UI presentation, query logic, HTTP transport, response parsing, and user feedback into distinct layers. Feature Component initiates requests through React Query Hook, which manages caching and retry logic before delegating to Axios Service with authentication interceptors. FastAPI Backend returns standardized responses that flow through Response Handler for parsing, then trigger UI Actions like toasts or redirects back to the Feature Component. This layered approach enforces separation of concerns, improves testability, and centralizes cross-cutting concerns like auth and error handling. Fork and customize this diagram to document your own client-side architecture or embed it in design system documentation.