By Joshua Kerievsky

What does poor software design look like and how can you safely clean it up? Learn a catalog of common code smells and how to produce cleaner, better designs. Then learn the art of refactoring: how to safely improve the design of code using proven strategies and tactics.

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Detangle Designs: Identify and safely improve hazardous or awkward designs. Learn more...
Instant Critiques: Take a refactoring exercise and get instant feedback from our automated band of experts. Learn more...

Expert Videos: Learn tools & techniques by watching short videos from industry experts. Learn more...
Integrated Forums: Ask questions, get expert replies and read fascinating discussions. Learn more...


  • 8-12 hours of content
  • 319 pages
  • 21 Code Smells
  • 11 Strategies & Tactics
  • 33 Interactive quizzes
  • 5 Exercises
  • Solution code & videos
  • 29 Videos
  • Automated Refactoring Critique
  • Support for Eclipse
  • Support for IntelliJ IDEA


Supported Browsers

  • Latest Firefox
  • Latest Edge
  • Latest Chrome
  • Latest Safari

Operating Systems

  • Windows
  • Linux
  • Mac OS

Development Tools

All of our programming exercises come with projects pre-configured for IntelliJ, Eclipse and Visual Studio.

Speakers or headphones are required for our videos.