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A Clean Architecture Starter from Diagrams

How to use UML diagrams to generate a clean architecture baseline with stable contracts, separated layers, and a runnable full-stack scaffold.

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Good scaffolding isn’t about generating the most code — it’s about generating the right structure so teams can move fast without re-architecting later.

This post outlines a pragmatic “clean baseline” you can generate from coherent diagrams.

What a good baseline includes

  • Clear separation: UI, application services, domain, adapters
  • Stable contracts between layers (DTOs, ports, interfaces)
  • Consistent naming and boundaries (one concept → one name)
  • Runnable end-to-end so you can validate behavior early

Why diagrams help

Diagrams encode intent at different “altitudes”:

  • Class diagram: domain model + ownership
  • Sequence diagram: behavior + API shape
  • Activity / state: process and lifecycle rules

When diagrams are coherent, generation can produce a baseline that’s understandable and maintainable.

A simple workflow

  1. Model the domain (class diagram)
  2. Model one critical flow (sequence diagram)
  3. Add workflow/lifecycle views only where state matters
  4. Validate consistency
  5. Generate baseline → run it → iterate

Next steps