SOLID Principles: Writing Code That Survives the Real World

Writing software is not just about making things work. It’s about making things work today, tomorrow, and one year from now. Last week, we explored Event-Driven Architecture — how systems communicate and scale. This week, we’re stepping into something even more foundational: SOLID Principles SOLID is not a framework. It’s not a library. It’s a way of thinking. Each letter in SOLID represents a principle that helps us design clean, flexible, and maintainable software. Before we go technical, imagine yourself as a kid with a lot of toys: One toy should do one thing. A spoon is for eating. A toothbrush is for brushing teeth. If your spoon also tried to brush your teeth, that would be weird, right? That’s where the first principle comes in. S – Single Responsibility Principle (SRP) One thing = One job A class should have only one responsibility. It should have only one reason to change. If a class handles: user registration sending emails saving data to the database …that’s too much respon