Here is one that's based on Ruby from Shopify. It goes over the http spec and builds an application that can talk to a fake database (yaml file I believe), and

Here is one that's based on Ruby from Shopify. It goes over the http spec and builds an application that can talk to a fake database (yaml file I believe), and then eventually goes into replacing parts of it with Rails. I found it really entertaining and fun to work at such a "low level". https://shopify.engineering/building-web-app-ruby-rails https://shopify.engineering/building-web-app-ruby-rails