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Matthias Siller has over 23 years of work experience in various roles within the technology industry. Matthias began their career at T-Systems Austria in 1999 as a Teamleader for Unix Applications and later became a Teamlead for Unix & Windows Applications. In 2012, they became the Head of GCU Midmarket before taking on the role of Head of GDU DPS, where they were responsible for operating servers, virtualization platforms, and storage systems. From 2014 to 2018, Matthias served as the Head of Computing Services and Head of ITO / GCU EMEA at T-Systems Austria. Matthias then transitioned to the position of Head of Digital Innovation & Transformation and Head of Digital Acceleration until 2020. From 2020 to 2022, they worked at T-Systems International as a Member of International Cloud Services LACE. In 2021, Matthias joined T-Systems Schweiz as the Head of Cloud Services Alpine. In 2022, they started working at REWE International AG as the IT Director Technology, where they have overall responsibility for the Technology Cluster.

Matthias Siller completed their AHS Matura in General Studies at BG & BRG Ettenreichgasse in Vienna from 1986 to 1994. Matthias then pursued a Master's degree in Business Informatics at the University of Vienna from 2000 to 2008.