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Dennis Klein currently serves as IT-Ausbilder und stellv. Teamleiter at TERTIA-Gruppe, where responsibilities include providing 1st, 2nd, and 3rd Level Support, managing Microsoft 365, and overseeing employee development and planning. Prior to this role, Dennis gained extensive experience in IT system integration as a Fachinformatiker. Previous positions include Store Manager at Snipes SE and Samsonite, focusing on visual merchandising, KPI management, and staff oversight. Earlier career stages involved roles at Enterprise Rent-A-Car and Hajoona GmbH, where customer management and employee coaching were key components. Education credentials include an Ausbildung IHK in Fachinformatiker IT Systemintegration from Comcave College Koblenz and ongoing studies as a certified HR specialist.