George Kalyvas - Email & Phone Number

Chief Operating Officer (COO) at Upstream

George Kalyvas is based out of Greece and works at Upstream as Chief Operating Officer (COO).

George Kalyvas's Contact Information

George Kalyvas's Work email

g*****@upstre***.network

Valid

Latest update

September 18, 2025

Location

Greece

George's current employer

Upstream

Description

Upstream is a leading mobile technology company driving digital acquisitions and sales across every mobile channel available.

Website

upstreamsystems.com

HQ Location

London, Greater london, United kingdom

Number of employees

201-500

Industry

Advertising Services

Latest update

May 1, 2024

Read about Upstream

Frequent questions about George Kalyvas

What company is George Kalyvas working for?

George Kalyvas works for Upstream.

What is George Kalyvas's function at Upstream?

George Kalyvas is Chief Operating Officer (COO) at Upstream.

Where is George Kalyvas based?

George Kalyvas is based out of Greece.

What is George Kalyvas's work email address?

George Kalyvas's professional email address is g*****@upstre***.network

Who are George Kalyvas's co-workers?

George Kalyvas's colleagues are Dimitris Maniatis, Bryant Smith, Konstantinos Kastanis, Paul Zimmermann, Marco Veremis, Lambros Sialmas, Stavros Stavrakoudis, Predrag Kilibarda, Michalis Ergazakis, George Serfiotis, Tom Prior, George Togkas, Tim Fernback, Nazaret Kazarian, Mohamed KHALEF, Frank Callahan, Angie Knapp, Dragos Nitulescu, Liz Buethner, Vinícius Otranto, Deni Plessa, Tim Satyagraha, Thanassis Koukoutselos, Barbara Sá, Farah Kokobile, Alok Srivastava, Ioannis Magnis, Jenny Anderson, Anna Prifti, Dan Huber, Wayne Wilson, Nikos Drivas, Rodrigo Mello, Sofia Marinou, Jacqueline Mburu.

George's co-workers

Dimitris Maniatis

Chief Executive Officer

Bryant Smith

Owner

Konstantinos Kastanis

Co-Founder & Executive Chairman

Lambros Sialmas

Vice President, Operations

Stavros Stavrakoudis

Regional CFO

Predrag Kilibarda

Networks Manager at the Cloud Platform Engineering Department

Michalis Ergazakis

Cloud Platform Engineering Manager

VP Commercial Operations Africa

Tim Fernback

CFO

Nazaret Kazarian

Software Architect / VP Engineering

Director of Human Resources

Dragos Nitulescu

Business Director (Telecom) | EMEA

Liz Buethner

Director Client Services

Vinícius Otranto

Business Development Director

Deni Plessa

Head of HR

Tim Satyagraha

Regional Sales Director

Thanassis Koukoutselos

Digital Performance Director

Barbara Sá

Account Director

Farah Kokobile

Regional Sales Director

Alok Srivastava

Jt Managing Director

Ioannis Magnis

PMO & IT Operations Director - Africa

Client Service Director

Wayne Wilson

Ad Sales Director (Africa)

Nikos Drivas

Digital Performance Director

Rodrigo Mello

Sales Director LATAM

Sofia Marinou

Head Of Corporate Communications

Jacqueline Mburu

Commercial Sales Director- Country Manager- Kenya

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