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Siegfried Hollerer is currently serving as a NIS Auditor at Bundesministerium für Inneres since March 2023, focusing on the compliance of security measures, analyzing external audit results, and providing recommendations for enhancing cybersecurity. Simultaneously, Siegfried is a lecturer at Fachhochschule St Pölten, teaching courses on Web Application and Infrastructure Penetration Testing. At Technische Universität Wien, Siegfried contributes as a project assistant in the "SafeSec System Modeling" research project. Previous experience includes a Senior IT-Security Consultant role at TÜV TRUST IT TÜV Austria GmbH, where Siegfried conducted penetration tests and managed security-related projects. Earlier positions include Penetration Tester at Cognosec and an internship as an IT Security Consultant at Raiffeisen Informatik. Siegfried holds a Diplom-Ingenieurin in Information Security and a Bachelor of Science in IT Security, complemented by ongoing education at Technische Universität Wien since 2020.