An Advanced Planning and Scheduling (APS) developer designs, develops, and implements software applications that optimize manufacturing and production processes. Their tasks include creating complex algorithms to improve scheduling efficiency, analyzing and interpreting data to predict potential bottlenecks, integrating APS solutions with existing ERP systems, and ensuring the software's reliability and accuracy. They also troubleshoot issues, provide technical support, and continuously enhance the system's functionality based on user feedback. Their work aims to increase productivity, reduce costs, and improve the overall operational efficiency of a manufacturing facility.