Konstantinos Kastanis
Deputy Chief Executive Officer at Upstream
Others working in Upstream
Nick Kotzalas
Chief Software Architect at Upstream
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Alice Sundin
General Manager Latam at Upstream
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George Serfiotis
Group Chief Financial Officer at Upstream
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George Kalyvas
Chief Commercial Officer (CCO) at Upstream
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Konstantinos Kastanis's current Workspace
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