Design Patterns course syllabus
Follow the lessons in order — each one builds on the last. Tick them off as you go.
- Design Patterns Introduction What design patterns are, the three Gang of Four categories, and how to use patterns without over-engineering. 4 min
- SOLID Principles Explained with Examples Single responsibility, open/closed, Liskov substitution, interface segregation and dependency inversion — with before/after code. 6 min
- Creational Patterns: Factory, Builder & Singleton Factory Method, Abstract Factory, Builder and Singleton — what problem each solves and when to avoid them. 5 min
- Structural Patterns: Adapter, Decorator & Facade Adapter, Decorator, Facade, Proxy and Composite patterns explained with practical backend examples. 7 min
- Behavioral Patterns: Strategy, Observer & Command Strategy, Observer, Command, State and Template Method — how objects collaborate, with runnable Python code. 7 min
- Design Patterns & SOLID Interview Questions Frequently asked design pattern and SOLID interview questions with concise answers and code-level explanations. 5 min
Design Patterns FAQ
Is this Design Patterns tutorial free?
Yes. All 6 Design Patterns lessons are free to read online with no sign-up. Each one includes working code examples you can copy and run.
Is Design Patterns good for beginners?
Yes. The tutorial starts with "Design Patterns Introduction" and builds up one concept at a time, so you don't need any prior Design Patterns experience — just follow the lessons in order.
How long does it take to learn Design Patterns?
Reading all 6 lessons takes about 1 hour. Most learners need a few weeks of hands-on practice alongside the lessons to feel confident using Design Patterns on real projects.
What should I learn after Design Patterns?
Good next topics are Algorithms, Computer Networks, Data Structures, Operating Systems. The Backend Developer Roadmap shows the full order.