You can group your serving community in teams and you can choose if those teams will allow public sign-ups. This way you know in real time who is serving, in what team and if a new person wants to join the team, you are notified.
Team can be made public or private and can have the sign-up option active or not.
You can also set up team leaders and offer them specific permissions to manage the app. You can view more in our Permissions documentation.