What do you understand by microservices architecture, and what are the pros and cons you've seen in real systems?

Microservice architecture is an approach to building applications as a set of small, independent services, each responsible for its own business function and interacting with others through well-defined APIs.

Pros:

• Scalability: only the services experiencing load need to be scaled.
• Development and deployment independence: teams can work in parallel, updating services without stopping the entire system.
• Resilience: failure of one service does not lead to the collapse of the entire application.
• Technological flexibility: different services can be written in different languages and use different technologies.

Cons:

• Management complexity: orchestration, monitoring, and logging of a distributed system are required.
• Difficulties with transactions and data consistency.
• Increased overhead for communication between services.
• A well-thought-out API architecture and error handling in network interactions are necessary.

In real systems, microservices are well-suited for large projects with distributed teams, but for small applications, they can introduce unnecessary complexity.