Ioannis Tsarmantidis

- Led end-to-end migrations from SAP R/3 & heterogeneous legacy systems to S/4HANA Cloud. - Managed ETL pipelines with SAP Migration Cockpit (LTMC/LTMOM), HANA SQL Script & Python. - Defined mapping & transformation rules for master and transactional data (MARA, KNA1, etc.). - Built data-profiling / cleansing workflows in Alteryx & pandas to achieve zero-defect loads. - Developed data-quality KPIs & reconciliation dashboards in Power BI. - Ensured audit-ready documentation and compliance

- Conducted IT audits under IDW PS 880, ISAE 3000/3402, and related standards. - Assessed ITGCs, role concepts, change management, and automated controls in SAP systems. - Created compliant audit documentation (working papers, memos, reports) and aligned with - stakeholders. - Facilitated interim and final meetings with management and business leads. - Supported migration audits and IT risk assessments during system transitions. - Used Alteryx, Excel, Power BI for data analysis and control testing.

Werkstudent im Beratungsfeld Digital Risk insbesondere folgender Aufgaben: - Journal Entry Testing (JET) - Toolbasierte Analyse und Auswertung großer DatenmengenWerkstudent im Beratungsfeld Digital Risk insbesondere folgender Aufgaben: - Journal Entry Testing (JET) - Toolbasierte Analyse und Auswertung großer Datenmengen