Looks-wise, this is an exact design clone too. Hope that doesn't get anyone who uses this "as is" in any trouble with the real Medium.
This project is a fork of a Medium clone which began as Ken Hibino's personal side project to learn Rails and React. I upgraded and refactored parts of the Rails app and integrated Dante2 wysiwyg editor.
If you're looking for commentary around the project or Rails, check Hacker News.