An apparatus includes a memory and a hardware processor. The memory stores one or more scheduling histories. The processor receives a first list from a first client device and a second list from a second client device. The first list includes a first job and the second list includes a second job. The processor calculates a first resource requirement to execute the first job and a second resource requirement to execute the second job. The processor determines that a conflict exists between the first job and the second job and in response, communicates messages to the first and second client devices indicating the conflict and proposed times for executing the jobs. The processor determines based on responses to the messages, execution times for the first and second jobs, assigns permission identifiers to the first and second jobs, and communicates a schedule.