Writing code that works is not enough—great software must also be clean, maintainable, scalable, and easy to evolve.

This course introduces you to the SOLID Principles, the foundation of modern software architecture and object-oriented design used by professional developers worldwide.

• In this course, you’ll learn why bad design leads to fragile, tightly coupled systems and how applying SOLID principles helps you build flexible, testable, and future-proof applications. Each principle is explained step by step, starting from the problem, moving to the design flaw, and finally arriving at the correct, SOLID-compliant solution.

• This course goes beyond theory and emphasizes real-world application. You will see how SOLID principles are implemented in object-oriented programming with Java and Spring Boot 4, helping you build clean architecture, create strong abstractions, and design scalable, maintainable systems

SOLID Principles Covered

S — Single Responsibility Principle (SRP)

O — Open/Closed Principle (OCP)

L — Liskov Substitution Principle (LSP)

I — Interface Segregation Principle (ISP)

D — Dependency Inversion Principle (DIP)

Each principle is explained using simple language, step-by-step examples, and before-and-after refactoring, so you clearly see the impact of good vs bad design.

By the end of this course, you won’t just know SOLID principles—you’ll be able to apply them confidently in real-world projects, making your codebase robust, scalable, and future-proof.