Hi, I am an experienced software engineer working with Ruby on Rails since 5 years. Besides other projects, I have been working for a leading e-commerce platform based in UK, doing full-stack web development including designing and building APIs, connecting to APIs, DevOps work and dealing with user issues.
I have gone through the code and the medium post. To be honest, I didn't understand why you wanted to start with this codebase. For starters it doesn't seem like a high quality work (I could already spot a few problems). Also it's a full Rails application, the pages, the styles and other stuff. Don't you already have an application working on the DB you are referring to?