Need help with on call style component

I am trying to create an in house app for a staff of approx. 40. Where there are different on call staff on multiple positions each week on a rotating basis. (Ie. On call supervisors and technicians) I am looking to create a component on my app that will show the user who those staff are from day to day. Incase changes have been made throughout the timeframe but no matter how I think of creating that, I get stuck. Has anybody tried this kind of task before? Any help or suggestion is truly appreciated.