OverviewOur client is seeking an experienced Data Engineer to support a critical data migration programme within a banking environment. This role focuses on high-volume payments systems, requiring deep expertise in IBM DB2 on mainframe, safe data extraction, and end-to-end migration assurance.Key ResponsibilitiesDeliver data migration activities within banking or payments systems, ensuring zero disruption to live transaction processingDesign and execute safe data extraction strategies from complex, high-volume, and highly concurrent tablesPerform data mapping, lineage analysis, and documentationLead data reconciliation and validation of migrated datasetsDevelop and optimise ETL processes within controlled production environmentsEnsure production safety, minimising risk to BAU payment processingProactively identify risks, issues, and dependencies, with clear and timely escalationCore Technical SkillsStrong expertise in IBM DB2 on Mainframe, including:Indexing, clustering, partitioning, and archivingQuery optimisation in high-throughput environmentsExperience working with large-scale, high-volume systems where extraction must not impact live processingProven ability in:Extracting data from complex and congested schemasDesigning non-intrusive extraction techniquesManaging data lineage and traceabilityRequired ExperienceHands-on delivery of data migration in banking, ideally within payments systems or other mission-critical transaction platformsExperience working in controlled pr