An SAP ISU job involves working with SAP's Industry-Specific Utility (IS-U) module, which is designed for utility companies to manage customer service, billing, metering, and invoicing. Professionals in this role configure, maintain, and optimize SAP IS-U processes to ensure efficient operations. They may work as functional consultants, technical consultants, or developers, depending on their expertise. The job requires knowledge of utility industry processes and SAP modules like CRM, FI-CA, and Device Management.