How SOLID Principles Are Reshaping One Developer's Approach to Low-Level Design

A software engineer exploring Low-Level Design (LLD) has shared how the SOLID principles are changing the way they think about writing maintainable code. Rather than memorizing definitions, the developer focused on understanding the real problems each principle aims to prevent, such as classes with too many reasons to change or tight coupling between components. Key insights included reframing the Single Responsibility Principle around independent reasons for change, and viewing the Open/Closed Principle as designing stable abstractions rather than freezing code. The Liskov Substitution Principle highlighted that subclasses must honor the behavioral promises of their parent abstractions, not just override methods. Together, the five principles reinforced a core idea: good LLD is about making code easier to change without adding unnecessary complexity.