Reflex is a full-stack Python web framework that compiles Python code into a React frontend, enabling developers to build interactive web applications entirely in Python. In production, it serves as a stateful, event-driven framework with a component system, reactive state management, and a compiler that generates JavaScript/React from Python. The architecture is a multi-package monorepo: core types and compiler (reflex-base), UI component libraries (reflex-components-* wrapping Radix UI, Recharts, Plotly, etc.), a build SDK for cloud deployment (reflex-build-sdk), a hosting CLI (reflex-hosting-cli), a durable workflow engine (reflex-workflow), observability via OpenTelemetry (reflex-otel), documentation generation (reflex-docgen), and benchmarking infrastructure (reflex-bench). Key entry points include the CLI (reflex run, reflex deploy), the Python API (rx.App, rx.State, rx.Component), and the compiler that transforms Python component trees into React code. Data flows involve user-defined state classes with computed vars and event handlers, which the compiler serializes into JavaScript state management; the server uses Starlette with Socket.IO for real-time event propagation, and state can be persisted in memory, disk, or Redis. External dependencies include Node.js, Bun, React, Radix UI, Recharts, Plotly, SQLAlchemy, Redis, Postgres, and numerous npm packages. The framework is actively maintained with extensive unit, integration, and performance tests, and it dogfoods its own documentation site.