What principles guided the decomposition of the monolith into microservices? How did you determine which part to isolate into a separate service?

When decomposing a monolith into microservices, the key factors were:

• Business constraints and contexts: services were distinguished by business domains so that each service is responsible for a specific business function (e.g., user management, payments, product catalog).

• Independence of development and deployment: parts that change frequently or require separate scaling were chosen so they could be developed and deployed independently.

• Data boundaries: services were designed to have their own databases and minimize shared data, reducing coupling.

• Technical constraints and dependencies: considerations were made regarding components that use common libraries or external services to avoid unnecessary communication complexities.

• Team structure: efforts were made to align services with teams so that each team could fully own its service.

Ultimately, services were defined based on business logic, technical requirements, and organizational factors to ensure maximum autonomy and ease of maintenance.