Have you applied design patterns when developing microservice architecture?

In microservices architecture, design patterns are often used to solve common problems and improve system quality. For example:

• API Gateway — a single entry point for all microservices, simplifying routing and security.
• Circuit Breaker — prevents cascading failures by disabling calls to non-responsive services.
• Service Discovery — automatic detection of microservice addresses.
• Saga — a pattern for managing distributed transactions.

An example of using Circuit Breaker with the Resilience4j library in Java:

CircuitBreaker circuitBreaker = CircuitBreaker.ofDefaults("myService");
Supplier<String> decoratedSupplier = CircuitBreaker
    .decorateSupplier(circuitBreaker, () -> callRemoteService());

Try<String> result = Try.ofSupplier(decoratedSupplier)
    .recover(throwable -> "Fallback response");

This approach helps make the system more resilient and manageable.