There's No Such Thing as a Free Gem: How to roll your own Twitter OAuth flow in Rails

Dependency management is one of the most important aspects of modern application engineering, but the nuance required to navigate its inherent trade-offs is something few people take the time to thoughtfully consider. So today, let’s take that time as we ship an example feature: implementing sign-in with Twitter as a third-party OAuth provider for a new Ruby on Rails app. This will give us an opportunity to to explore the contours of an ever-present tension on software teams: should we solve this problem by relying on a dependency or by rolling our own implementation?.