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Design Patterns for Software Engineering

Mar 4 · 5 min read · Introduction As developers grow from writing basic code to building scalable systems, one realization becomes clear: Writing code that works is easy.Writing code that scales, evolves, and remains mai

Builder Design Pattern

Mar 3 · 4 min read · Why Builder Pattern Exists When creating complex objects, constructors can become messy. Example: User user = new User("Souvik", 25, "Kolkata", "India", "Developer", true, false); Problems: Hard to

Decorator Design Pattern

Mar 3 · 4 min read · Why Decorator Pattern Exists In real applications, we often need to add extra functionality to an object. Examples: Adding logging to a service Adding authentication to a controller Adding compress

Observer Design Pattern

Mar 3 · 4 min read · Why Observer Pattern Exists In real systems, objects often depend on other objects’ state changes. Examples: When stock price changes → update dashboards When order is placed → send email + SMS + up

Strategy Design Pattern

Mar 3 · 4 min read · Why Strategy Pattern Exists In real applications, we often need to change behavior at runtime. Examples: Different payment processing logic Different discount calculation strategies Different sorti