In a Scrum team, which role is not counted in the Development Team size?

In Scrum, the Development Team is composed of professionals who work together to deliver a potentially releasable product increment at the end of each Sprint. This team is self-organizing and cross-functional, meaning it has all the competencies needed to accomplish the work without depending on outsiders.

The role of the Product Owner is not part of the Development Team; rather, it is a separate role focused on maximizing the value of the product resulting from the work of the Development Team. The Product Owner is responsible for managing the product backlog and ensuring that it aligns with customer needs and organizational goals. Unlike members of the Development Team, the Product Owner does not contribute directly to the technical work of building the product increment. Instead, they facilitate and guide the team's efforts to produce valuable outcomes.

The other roles mentioned—which include the Software Architect, Scrum Master, and Database Administrator—are typically part of the Development Team in various contexts, as they directly contribute to the technical work and delivery of the product increment. Therefore, it is clear that the role of the Product Owner is not included when counting the size of the Development Team.