A Software Development Project Manager is responsible for overseeing and coordinating the development of software projects. They play a crucial role in ensuring that software development projects are completed on time, within budget, and to the satisfaction of the stakeholders. The specific responsibilities of a Software Development Project Manager can vary depending on the organization, but some of the common tasks include:

1. Project Planning: The Project Manager is responsible for defining project scope, goals, and deliverables that support business goals in collaboration with senior management and stakeholders.

2. Resource Allocation: The Project Manager is responsible for determining the resources (such as time, budget, and personnel) required to complete the project, and then assigning those resources to specific tasks.

3. Project Scheduling: The Project Manager is responsible for developing a project schedule, including task assignments and deadlines, and ensuring that the project stays on track.

4. Risk Management: The Project Manager is responsible for identifying potential risks to the project and developing strategies to mitigate those risks.

5. Budget Management: The Project Manager is responsible for developing a project budget, tracking expenses, and ensuring that the project stays within budget.

6. Communication Management: The Project Manager is responsible for communicating project status, progress, and issues to stakeholders and senior management, and for facilitating communication between team members.

7. Quality Management: The Project Manager is responsible for ensuring that the software development process follows industry best practices and standards and that the final product meets quality standards.

8. Team Management: The Project Manager is responsible for leading, motivating, and mentoring the software development team, and for resolving any conflicts that may arise.

9. Vendor Management: The Project Manager may be responsible for managing relationships with external vendors and contractors, and for ensuring that they deliver their services and products on time and within budget.

10. Post-Project Review: The Project Manager is responsible for conducting a post-project review to assess the success of the project and to identify areas for improvement for future projects.