Great software is not written.
It’s designed.
Most systems don’t fail because of bad developers.
They fail because of bad design decisions made early — and scaled blindly.
This is the foundation every serious engineer and tech leader must master 👇
Design Principles & Patterns
🔹 SOLID
SRP – One class, one reason to change
OCP – Extend, don’t modify
LSP – Substitutions must be safe
ISP – Small, focused interfaces
DIP – Depend on abstractions, not concretes
SOLID isn’t theory. It’s how you avoid rewriting your system every 6 months.
🔹 GoF Design Patterns
1) Creational → Control how objects are created (Factory, Builder, Singleton)
2) Structural → Control how objects are composed (Adapter, Facade, Proxy)
3) Behavioral → Control how objects communicate (Strategy, Observer, Command)
Patterns are not “fancy code.”
They are battle-tested solutions to recurring problems.
🔹 DRY – Don’t Repeat Yourself
Duplication is a silent killer.
It multiplies bugs and slows teams.
🔹 KISS – Keep It Simple
Complexity is not intelligence.
Simplicity is.
🔹 MVC + Repository + Unit of Work
Clean separation of concerns.
Predictable codebases.
Scalable teams.
Reality check:
Frameworks change.
Languages change.
Trends change.
Principles don’t.
If you want to build:
Systems that scale
Teams that move fast
Products that survive years
Master the fundamentals.
Everything else is noise.
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