Online Advertising School is a web app designed to teach people how to more effectively advertise online.
I built the app on Ruby on Rails to manage a blog with categories, tagging, email signups, and other basic things. OAS uses a membership business model, so I have also built a paywall to create members only content, screencasts, forums, and other features. Recurring, subscription payments are built in using Stripe.
I also produce much of the content on the site.