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Kostas Kastanis
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Kostas Kastanis
Deputy Chief Executive Officer at Upstream
Companies (1)
Upstream
Deputy Chief Executive Officer
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YC S23
Growth
7
London, England, United Kingdom
Productivity · B2B Software and Services
People at Upstream
Alex Vratskides
Advisor
Dimitris Maniatis
Chief Executive Officer
George Margaritis
Senior User Experience Designer
Guy Krief
Advisor
Jonathan Tiret
Ken Campbell
Non Executive Director & Board Member
View all at Upstream →
