Proxies Encryption PubSub CQRS Encoding Exponential Backoff Rate Limiting JSON Web Tokens Generics in Go Columnnar Databases Graceful Shutdowns Creational Design Patterns: Factory Method Abstract Factory Singleton Builder Prototype Structural Design Patterns: Adapter Bridge Composite Decorator Facade Flyweight Behavioral Design Patterns: Chain of Responsibility Command Mediator Observer Memento State Strategy Visitor Iterator Template Method