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Feature Flags

A feature flag is a technique to turn a feature in a product on or off without deploying new code, via configuration. Since code goes to production, even if it doesn't turn on functionality for customers, fewer code branches need to be maintained.

  1. Intro to Feature Flags

    Feature flags are a software development technique that allows developers to turn features on and off at runtime without deploying new code.
    • Flickr logo
      Flipping Out (With Feature Flags)

      Ross Harmes, Head of Engineering, Flickr

      This article from 2009 was the first time an engineering team wrote about feature flags. It describes Flickr's system, where all code is integrated as soon as it's committed.
    • Earnest logo
      Feature Toggles (aka Feature Flags)

      Pete Hodgson, Engineering Lead, Earnest

      This comprehensive technical article covers categories of toggles, implementation techniques, toggle configuration, and working with feature-flagged systems.