Designing for Change: Turning Fragile Code into Resilient Systems

Good software design is fundamentally about creating code that can absorb new requirements without breaking or requiring massive rewrites. This article demonstrates how classic design principles—particularly Single Responsibility and Dependency Inversion—transform a fragile notification system into a maintainable, testable solution. By connecting theory to practice, it shows why these principles are essential tools for reducing technical debt and accelerating development in real-world projects.