For a team your size, anchor your scrum process in software configuration management using either GitHub or GitLab. Use the issue tracker to manage "user storie

For a team your size, anchor your scrum process in software configuration management using either GitHub or GitLab. Use the issue tracker to manage "user stories". Use milestones as "sprints". Use issues assigned to milestones as "sprint backlog" and issues unassigned to specific milestones as "product backlog". Take advantage of the ability to drag and drop sort issues to keep your backlog prioritized.