PRIMARY PURPOSE: Under the general direction of the Manager, Market Settlement Disputes, verifies, validates, analyzes and corrects transactional data related to Markets, Scheduling and Grid Operations to ensure accurate market data and settlement results.  Independently researches settlement issues, identified root causes and recommends and implements appropriate resolutions.  Develop and improve business processes and controls for new and existing business processes, and participate in the design, testing and implementation of business and system changes.   PRINCIPAL DUTIES AND RESPONSIBILITIES:   Researches, analyzes, and resolves market settlement disputes and transactional data issues in accordance with applicable Tariff requirements, Business Practice Manuals, and established timelines. Collaborates with cross-functional teams to resolve complex issues and evaluates upstream and downstream impacts.   Performs and validates data corrections to ensure accurate settlement results. Identifies root causes, escalates data, software, legal, or policy issues as appropriate, and initiates software defects when necessary.   Communicates dispute determinations and resolutions to customers and internal stakeholders. Represents the business unit in cross-functional meetings and supports resolution of complex settlement issues. Produces and maintains settlement validation, dispute, defect, and resolution reports to ensure accurate and timely information for management reporting and performance metrics.   Identifies and implements process improvements that enhance operational efficiency, data quality, and controls.  Supports user acceptance testing for system and market initiatives and maintains working knowledge of policy, system, and data changes necessary to effectively investigate and resolve disputes.