Who should decide on synchronous or asynchronous integration — the product manager or the developer?

The decision to choose between synchronous or asynchronous integration should be made jointly by the product owner and the developer. The product owner defines the business requirements, including response time, user experience, and data criticality. The developer assesses the technical possibilities, limitations, and risks of implementing each option.

Ultimately, the product owner formulates the requirements and priorities, while the developer proposes the optimal technical solution based on the architecture and infrastructure. Joint discussion helps select an approach that meets business goals and is technically feasible and maintainable.