1Up Nutrition
This project is ongoing, as it consists of continuous iteration on a large legacy codebase. I've been the primary developer for many features on this site for over a year.
The site has many layers/generations of code, from the original Shopify theme (primarily written in jQuery many years ago) to recent components created using modern ES7 JavaScript. Working on this site has given me great experience and practice refactoring legacy code.
Feel free to check it out at 1Up Nutrition.