Learn how real software teams apply design patterns to control complexity and reduce the cost of change. This path focuses on practical architecture decisions—defining clear module boundaries, introducing seams for safe refactoring, and directing dependencies so high-value business logic stays stable while implementation details evolve.

Instead of abstract theory, each step uses small, concrete exercises to help you map your system, identify change hotspots, and introduce patterns that improve maintainability, testability, and team collaboration. By the end, you will have a set of repeatable techniques for designing systems that can evolve safely as requirements change.