We are looking for a senior SAP ABAP SME with strong experience across ECC and S/4HANA to review and validate SAP technical specifications used for extracting data into a data lake. Key Focus Areas Review and validate ABAP technical specifications (no ETL development) Reverse engineer custom Z-tables and ABAP logic across FI, MM, SD, HR, etc. Document data extraction logic, field mappings, business rules, and source-to-target lineage Collaborate with ABAP developers, functional teams, and data