Summary
In this chapter, we’ve explored how to apply Clean Architecture principles to legacy systems through systematic transformation. We began by examining how to evaluate existing systems through Clean Architecture’s lens, identifying architectural violations, and creating a staged approach to transformation.
We established a framework for building stakeholder alignment by translating technical debt into business impact terms and gathering deeper domain understanding through collaborative techniques like event storming. This collaborative approach directly informed our staged implementation plan, grounding our architectural decisions in business priorities.
Through our order processing example, we demonstrated a progressive implementation approach that maintains system stability while establishing clean architectural boundaries. We started with the Domain layer, creating proper entities and value objects that encapsulate business rules previously scattered...
