What microservice design patterns do you know?

In microservices architecture, various design patterns are used to organize service interactions and ensure scalability, fault tolerance, and ease of maintenance. Here are some of them:

• API Gateway — a single entry point for all clients that routes requests to the appropriate microservices, performs authentication, data aggregation, and other functions.

• Circuit Breaker — a pattern for handling failures in services, preventing cascading failures by temporarily blocking calls to non-responsive services.

• Saga — a pattern for managing distributed transactions, ensuring data consistency through a sequence of local transactions with compensating actions.

• Event Sourcing — storing the state of the system through a sequence of events, which simplifies recovery and auditing.

• CQRS (Command Query Responsibility Segregation) — separating read and write operations into different models to optimize performance and scalability.

• Sidecar — an auxiliary service that runs alongside the main microservice and provides additional capabilities, such as logging, monitoring, or proxy.

These patterns help build flexible and resilient microservice systems.