SOLID Principles - Crash Course

When you're solving a Low-Level Design (LLD) interview problem, you're not just expected to write working code. You're expected to write clean, modular, extensible, and maintainable code that reflects real-world engineering practices.

One of the best ways to do that? Apply the SOLID principles.

In this chapter, we'll break down each SOLID principle in detail, explore its real-world application in LLD interviews, and provide code-level intuition and examples that demonstrate how to incorporate these principles effectively.