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 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?

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