Various embodiments provide a scheduling system structured for generating at least one posting to fill a vacant post on a schedule. In an embodiment, the scheduling system includes a scheduling database and an automated rotation tool. The scheduling database includes a personnel roster and a schedule. The schedule includes a vacant post. The scheduling database transmits the schedule and the personnel roster to the automated rotation tool. The automated rotation tool includes a computer system, and receives the personnel roster and the vacant post beginning within the vacancy window from the scheduling database, and also receives a rule, a parameter, and a vacancy window. The automated rotation tool generates a posting assigning a person from the personnel roster to the vacant post according to the rule and the parameter, and transmits the posting to the scheduling database.