Lambros Sialmas - Email & Phone Number

Vice President, Operations at Upstream

Lambros Sialmas is based out of Greece and works at Upstream as Vice President, Operations.

Lambros Sialmas's Contact Information

Lambros Sialmas's Work email

l*****@upstre***.com

Valid

Latest update

September 18, 2025

Location

Greece

Lambros'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 Lambros Sialmas

What company is Lambros Sialmas working for?

Lambros Sialmas works for Upstream.

What is Lambros Sialmas's function at Upstream?

Lambros Sialmas is Vice President, Operations at Upstream.

Where is Lambros Sialmas based?

Lambros Sialmas is based out of Greece.

What is Lambros Sialmas's work email address?

Lambros Sialmas's professional email address is l*****@upstre***.com

Who are Lambros Sialmas's co-workers?

Lambros Sialmas's colleagues are Dimitris Maniatis, Bryant Smith, Konstantinos Kastanis, Paul Zimmermann, Marco Veremis, Stavros Stavrakoudis, George Kalyvas, 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.

Lambros's co-workers

Dimitris Maniatis

Chief Executive Officer

Bryant Smith

Owner

Konstantinos Kastanis

Co-Founder & Executive Chairman

Stavros Stavrakoudis

Regional CFO

George Kalyvas

Chief Operating Officer (COO)

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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