Experience defining and validating surveillance data requirements, mappings, and lineage across orders, executions, RFQs, market data, reference data, communications, and employee data, including completeness, accuracy, timeliness, exception management, and source-to-target reconciliation controls. Experience developing functional and technical requirements, data dictionaries, mapping specifications, test strategies, test cases, and defect-management artifacts, with hands-on participation in system integration testing, user acceptance testing, regression testing, and production validation.