Hellenic Telecommunications Organization SA
Efstratios Ninis is an experienced IT professional with a strong background in billing and financial applications engineering. Currently serving as the Head of Billing & Financial Applications Engineering at OTE Group of Companies since June 2014, Efstratios oversees the Revenue Management and Media Management Systems, focusing on the secure operation of IT systems and leading the development of new capabilities. Previously, at Accenture from December 2005 to May 2014, Efstratios held roles ranging from Manager to Analyst, directing teams in revenue-related systems, managing client expectations, and delivering complex IT projects. Early career experience includes a position as a Computer Engineer at the Computer Technology Institute and Press "Diophantus," specializing in research on embedded systems. Efstratios holds a Master's and Bachelor's degree in Computer Engineering from the University of Patras.
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