development

Structure business logic use-cases as a pipeline: extract context and tenant, authorize, validate inputs, execute core logic, handle errors, and publish domain events. This enforces clean architecture boundaries and reduces maintenance costs.

Handle external API integration in a multi-tenant application by routing requests through dedicated clients in a centralized client layer, ensuring safe isolation, explicit typing, and domain-driven correctness across boundaries.

SOLID principles and TDD enforce domain-driven design by requiring explicit typing and strict isolation of external logic, ensuring correctness across boundaries and guiding use-case pipelines from validation to event publishing.

Yes, this approach applies directly to multi-tenant use-case execution and error handling by enforcing explicit typing, domain-driven patterns, and safe external API integration through dedicated clients across the application.

Avoid a centralized client layer for external API logic when your application lacks multi-tenancy requirements or complex domain boundaries, as the overhead of explicit typing and clean architecture may outweigh maintenance benefits.