juniorSoftware Architecture
What are the SOLID principles?
Updated Apr 28, 2026
Short answer
SOLID is an acronym for five design principles intended to make software designs more understandable, flexible, and maintainable.
Deep explanation
Junior-level architecture is about mastering fundamental code organization. Principles like SOLID (Single Responsibility, Open/Closed, Liskov Substitution, Interface Segregation, and Dependency Inversion) provide the toolkit for writing code that doesn't rot. At this stage, understanding that 'good' code is code that is easy to change is paramount.
Real-world example
A simple blog application where the data access, business logic, and UI are kept in separate folders/layers.
Common mistakes
- Over-engineering a simple task by applying every design pattern known.
Follow-up questions
- What is the 'O' in SOLID?