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Lessons (6)

• Code Smells & Refactoring

  … Learn the 10 most common smells and the small, safe refactorings that fix each one. The big idea …

• What Is Clean Code?

  … That is your first clean code refactor.

• Vertical Slice Architecture & the Modular Monolith

  … fewer conflicts. ❌ Risk of duplicated logic between slices (refactor shared rules into the domain once they repeat); needs …

• What Are Design Patterns?

  … repeated pain C[Pick the matching pattern] C -- D[Refactor toward it] D -- A Patterns in modern JavaScript …

• O — Open/Closed Principle

  … When the second or third variation appears, refactor to an extension point. Key takeaways - Add new behaviour by …

• Frontend Testing Strategy

  … on what matters Tests that check behaviour survive refactors; tests that check internals break every time you change …