This repository powers a multi-domain interactive programming tutorial platform (learnpython.org, learnjavaonline.org, etc.). The core is a Flask web application that serves Markdown-based lessons, provides an in-browser code editor via a vendored CodeMirror 3.x, and executes user code through the Ideone SOAP API. It supports 18+ programming languages with per-domain configuration (editor modes, language IDs, default code). A newer 'vibe coding' feature uses a local browser-based AI model (SmolLM2-360M) to generate code from prompts. The application is deployed via Docker and relies on environment variables for credentials and domain selection. Architecturally, the app is a monolith with a thin Flask layer, static asset serving, and template rendering via Jinja2. Tutorial content is stored as structured Markdown files with consistent headings (Tutorial, Exercise, Tutorial Code, Expected Output, Solution) and is parsed and rendered at runtime. The system is highly internationalized, with 20+ language translations of the core Python tutorials. User progress tracking and authentication are stubbed (501 responses). The codebase includes vendored copies of Python-Markdown, the suds SOAP library, and many CodeMirror modes/addons. The platform has grown organically with significant technical debt: outdated vendored libraries (CodeMirror v3, suds, Markdown), Python 2/3 compatibility hacks, incomplete translations, many empty tutorial pages, and a fragile translation pipeline dependent on a specific OpenAI model. The lack of automated testing beyond basic coverage and the reliance on a third-party code execution API (Ideone) are notable risks. However, the domain configuration pattern in constants.py and the Ideone client wrapper are well-structured and could be reused in similar projects.