In what cases is it advisable to use a microservices architecture?

Microservice architecture is appropriate when:

• The system is large and complex, and it is convenient to divide it into independent parts with clearly defined boundaries.
• Independent scaling of individual components is required.
• Different teams work on different parts of the system, and isolation is needed for parallel development.
• High fault tolerance is necessary: a failure of one microservice should not stop the entire system.
• Flexibility in choosing technologies for different services is required.

For example, in an online store, separate microservices can be allocated for the product catalog, cart, payment, and notifications, which simplifies development and maintenance.