Mainframe Business Expert – German (m/f/d)

About the role

Join Commerzbank Poland as a Business Expert in the PUK segment, where the PC‑RB Datamart serves as a key data source for many applications and reports. You will help evolve the PC‑RB Datamart, support the decommissioning of the legacy CODABAS warehouse, and ensure the smooth operation of our mainframe‑based products.

Key responsibilities

• Analyse and clarify business requirements for PC‑RB Datamart and CODABAS.
• Create technical designs, data models, and DB2 table specifications.
• Develop and maintain the data model and support ongoing enhancements.
• Perform business and technical data analysis, testing, and quality assurance up to go‑live.
• Process stakeholder requests, evaluate data, and provide advice and support.

Required profile

• German language proficiency at B2+ level.
• English language proficiency at B2/C1 level.
• Strong analytical skills and ability to work with complex data sets.

Required skills

• Advanced SQL knowledge.
• Experience with z/OS and DB2 environments.
• Understanding of COBOL program structure and mainframe application basics.
• Proficiency in Excel and data‑modelling fundamentals.

What we offer

• Development plans, life insurance, and flexible working hours.
• Hybrid work model (remote + office on Wersalska 6, Łódź).
• Integration events and a supportive, agile, international team.