How did you define the boundaries of microservices?

Microservice boundaries are defined based on business domains and the responsibility of each service. Main approaches:

• Domain-Driven Design (DDD): highlighting contexts (bounded contexts), where each microservice is responsible for a specific context.
• Separation by business functions: each service implements a separate business process or functionality.
• Data isolation: a microservice owns its database and does not depend directly on data from other services.
• Minimizing coupling: services interact through well-defined APIs, avoiding tight integration.

In practice, I analyze business requirements, communication patterns, and data to identify services with maximum autonomy and minimal interdependence. This simplifies scaling, support, and system development.