A SAP CRM developer is responsible for developing, configuring, and maintaining the SAP Customer Relationship Management (CRM) system. This involves working with various teams within the organization to understand their business needs and requirements, and then translating those into technical solutions within the CRM system. The developer also works closely with other SAP systems to ensure smooth integration and data flow between them. In addition, the developer provides ongoing support and troubleshooting for users of the CRM system.