03/11/2025
Junior developer needs to know 2 SOLID principles
Middle dev needs to know 3 SOLID principles
Senior developer needs to know how not to use SOLID
SOLID principles are one of the most popular topics in software development.
They help you write flexible, maintainable, and extensible code.
But like any rule, they can be overused.
๐ ๐๐๐ป๐ถ๐ผ๐ฟ ๐๐ฒ๐๐ฒ๐น๐ผ๐ฝ๐ฒ๐ฟ:
Start simple.
Focus on the two principles that will immediately improve your code quality:
1๏ธโฃ Single Responsibility Principle (SRP) โ each class should have only one reason to change.
2๏ธโฃ Dependency Inversion (DIP)
Depend on abstractions, not concrete classes.
Master these two, and you'll write cleaner code from day one.
๐ ๐ ๐ถ๐ฑ๐ฑ๐น๐ฒ ๐๐ฒ๐๐ฒ๐น๐ผ๐ฝ๐ฒ๐ฟ:
The junior ones, plus:
3๏ธโฃ Open-Closed (OCP)
Extend behavior without modifying code.
4๏ธโฃ Interface Segregation Principle (ISP) โ don't force clients to depend on methods they donโt use.
5๏ธโฃ Liskov Substitution (LSP) โ subclasses should be replaceable with their base class without breaking behavior. Also, in modern development, it's more about classes following the behaviour of the interfaces.
These principles help you build maintainable systems that can grow.
๐ ๐ฆ๐ฒ๐ป๐ถ๐ผ๐ฟ ๐๐ฒ๐๐ฒ๐น๐ผ๐ฝ๐ฒ๐ฟ:
Needs to know something more valuable:
How NOT to use SOLID.
๐ช๐ต๐? ๐๐ฒ๐ฐ๐ฎ๐๐๐ฒ ๐๐ฒ๐ป๐ถ๐ผ๐ฟ๐ ๐๐ป๐ฑ๐ฒ๐ฟ๐๐๐ฎ๐ป๐ฑ:
โข SOLID principles are guidelines, not rules
โข Over-engineering is worse than simple code
โข Sometimes breaking SOLID is the right choice
๐ง๐ต๐ฒ ๐ง๐ฟ๐๐๐ต ๐๐ฏ๐ผ๐๐ ๐ฆ๐ข๐๐๐:
โ
They're tools, not strict commands
โ
Context matters more than principles
โ
Pragmatism beats perfectionism
๐ฅ๐ฒ๐บ๐ฒ๐บ๐ฏ๐ฒ๐ฟ:
โข Junior devs follow principles.
โข Middle devs master principles.
โข Senior devs know when to break them.
True seniority is knowing when to break or follow the rules to keep things simple.
What's your take? When was the last time you intentionally broke a SOLID principle for the right reasons? Share below ๐
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