Developers waste time copying code from static docs to test environments. A Markdown extension with executable cells would let them run examples directly in notes.
Create a VSCode extension or web app that renders Markdown with click-to-run code blocks. Support major languages with sandboxed execution.
Sell to engineering teams through monthly licenses for private repos and collaboration features.
Start with a free Chrome extension for GitHub READMEs, then monetize team features.
Risk: Existing notebook tools (Jupyter) could add Markdown support.