The Guardian is a team role in connection with a project. The Guardian is the first point of contact for you as a client regarding the project that the team does for you. He/she is responsible for the successful delivery of the project sprints and your overall engagement with the team. The Guardian:
Facilitate the clients business,
Advocate the clients business goals,
Have the overview of the project,
Help the client set SMART sprint goals,
Confirms deployment after testing is cleared,
Discusses sprint acceptance, planning and budget.
Manage the project & team in traditional sense,
Lead the team,
Estimate the necessary budget alone.