#design patterns

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• 10 backend design patterns senior engineers use, in Java 21 and Spring Boot

  Oct 26, 2026 22 min read

  Repository, Factory, Singleton, Strategy, Observer, Builder, Adapter, Decorator, CQRS and Circuit Breaker in tested Java 21 and Spring Boot code, with pitfalls.

  • #design patterns
  • #java
  • #spring boot
  • #backend
  • #resilience4j
  • #cqrs