This is the learning path every new developer has to follow when joining the XPeppers team.

This path reflects our team's culture and values, which have their roots in the agile values and principles, as well as in those of XP, and in the software craftsmanship manifesto.

Please feel free to fork and contribute, add materials, fix the existing ones and propose new stuff.

• Flat Organizations:
  • The Flat Way #onboarding
  • Teal Is The New Black: Self-management and the future of work
  • Collaborative decision making in self-organizing teams
• Read chapters 1, 4, 5, 7 of XP Explained #onboarding
• Read chapters 2, 6 of XP Explained
• Iterative and Incremental Development:
  • Waterfall #onboarding
  • Agile #onboarding
  • Transition
• For italian speakers, Watch "Perché è così difficile fare Extreme Programming" by Matteo Vaccari #onboarding
• Pair Programming #onboarding
• Agile Mindset:
  • What Exactly is the Agile Mindset? #onboarding
• Read The Pomodoro Technique paper
• Read first chapter of "Applying UML and Patterns"
  • Try to estimate the time needed to study that chapter (using the pomodoro technique)
  • Answer (for example on the team's wiki pages)
    • What is analysis?
    • What is design?
    • What's the difference between them?
    • What is design for?
      • in other words, how would you reply to the following statement: "I just need to understand what to do (analysis) and then do it (coding). Everything else does not matter!"

• Read chapter 9 "The Three Laws of TDD" of Clean Code #onboarding

• Read Test Driven Development: By Example

• Watch the Clean Code Talks series: these four videos (and the related blogpost series) are really valuable to learn how to design for testability.

  1. Watch "The Clean Code Talks - Unit Testing" video (~ 30 minutes) [slides]. Then read his blogpost. #onboarding

  2. Watch "The Clean Code Talks - Inheritance, Polymorphism, & Testing" video (~ 40 minutes). Then read his blogpost (there you can find the slides too). #onboarding

  3. Watch "The Clean Code Talks - Don't Look For Things!" video (~ 35 minutes) which talks about the Dependency Injection pattern. Then read his blogpost (there you can find the slides too).

  4. Watch "The Clean Code Talks - "Global State and Singletons" video (~ 55 minutes). Then read his blogpost (there you can find the slides too).

  5. For each video you watched, write a short post (e.g. on your public gist) on

  • what you learned
  • what puzzled you most?
  6. Read Miško Hevery's guide on "Writing Testable Code"

• Watch Lets Play on TDD by James Shore

• For italian speakers, Piergiuliano Bossi's screencasts on TDD are a good starting point: there are five basic lessons and a final video on emergent design.

• Do the Sales Kata in TDD #onboarding

• Extra: Follow the The World's Best Intro to TDD by J. B. Rainsberger

• Read the article Keep It DRY, Shy, and Tell the Other Guy #onboarding
• Read the article You Aren't Gonna Need It
• Tell Don't Ask principle
  • read the article Tell, Don't Ask
  • read the article The Art of Enbugging
• Do the Kata String Calculator
• Read first ten chapters of Clean Code
• SOLID principles #onboarding
  • SRP: Single Responsibility Principle
  • OCP: Open-Closed Principle
  • LSP: Liskov Substitution Principle
  • ISP: Interface Segregation Principle
  • DIP: Dependency Inversion Principle
• Start the Racing Car Katas #onboarding
  • find SOLID violations
• Read Names objects after things, not actions! by Matteo Vaccari
• Watch Venkat Subramaniam's talk about "Core Design Principles for Software Developers" #onboarding
• Read The Pragmatic Programmer
• Watch Is SOLID A Good Idea
• Watch Responsive Design
• Extra: Follow the "Clean coders" screencasts by Robert C. Martin

• Watch Martin Fowler @ OOP2014 "Workflows of Refactoring"
• Read first three chapters of Refactoring: Improving the design of existing code #onboarding
• Watch Testing and Refactoring Legacy Code
  • Example Code
• Try the GildedRoseKata #onboarding
  • Code Coverage
  • Code Refactoring
  • Add the new feature
• Try the TennisRefactoringKata (find code smells)

• Read The Four Elements of Simple Design #onboarding
• How to Write Clean, Testable Code
• Good Design is Easily-Learned
• Try to learn and repeat these Katas autonomously
  • TheBowlingGameKata
  • TheRomanNumeralsKata (video)
• Read the first eight chapters of Growing Object Oriented Software, Guided by Tests
• Mocks Aren't Stubs
• Encapsulation e Information Hiding:
  • http://www.natpryce.com/articles/000498.html
  • http://c2.com/cgi/wiki?EncapsulationIsNotInformationHiding
• Read Overcoming the one weakness of OOP
• Read Object Calisthenics
• Read about the Practical Test Pyramid
• Watch Ian Cooper - TDD, where did it all go wrong
• Watch J.B. Rainsberger - Integrated Tests Are A Scam
• Watch Sandro Mancuso - Testing and Refactoring Legacy Code
• Watch Sandro Mancuso - Crafted Design
• Watch Mock Roles Not Object States - Paper

• Read https://web.archive.org/web/20170916120520/http://alistair.cockburn.us/Hexagonal+architecture #onboarding
• Read http://matteo.vaccari.name/blog/the-hexagonal-architecture
• Read http://matteo.vaccari.name/blog/archives/154
• Read http://www.mountaingoatsoftware.com/blog/the-forgotten-layer-of-the-test-automation-pyramid
• Read http://c2.com/cgi/wiki?HexagonalArchitecture

• Read chapters about Stability 3, 4, 5 and Capacity 8, 9, 10 of Release It! #onboarding

• Watch 7 minutes, 26 seconds, and the Fundamental Theorem of Agile Software Development by J.B. Rainsberger

• Read chapter 3 "Economics of Software Development" of XP Explained
• Read chapter 7, section with title "Tools 22": Contracts of Lean Software Development: An Agile Toolkit

• Languages
• Tools
• On Microservices
• An Agile Study Path

• "Patterns of Enterprise Application Architecture" by Martin Fowler
• "Working Effectively with Legacy Code" by Micheal Feathers
• "Understanding the Four Rules of Simple Design" by C.Haines

• JoeBew's Study Path!