Constantine Spentzos in

Constantine Spentzos

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Head of Business Development at Proton
📍 Greater Madrid Metropolitan Area, Spain

Constantine Spentzos is the Head of Business Development at Proton, specializing in helping SMBs adopt privacy-focused, EU-based digital tools. He has a strong track record of building and leading international B2B sales teams from the ground up at companies like IKONO and Juni. He holds a Masters in Business Administration.

Outside of his sales leadership roles, Constantine has a demonstrated interest in manufacturing and design, having previously created a video series on designing parts for injection molding. During his time at Stony Brook University, he was a sophomore member of the sailing team.

He has an interesting background in creating educational content about complex manufacturing processes, a unique skill for a sales leader.

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Experience
4 Years
Current Role
Head of Business Development
Job Level
Mid-senior
Location
Greater Madrid Metropolitan Area, Spain
Personality Overview

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Communication Style
Decision Approach
Work Preference

Behavioral traits and communication patterns that shape how this person evaluates opportunities, builds trust, and makes decisions in professional settings.

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Priorities

Topics Constantine cares about

Data Privacy
His current role at Proton is focused on helping companies maintain their privacy and security by moving away from big US tech vendors to an EU-based suite.
B2B Sales Leadership
Has extensive experience building, hiring for, and leading distributed B2B sales teams across Europe at multiple companies, including IKONO, The/Studio, and Juni.
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Career

Work history

9-2025
Head of Business Development
Proton
10-2024 - 10-2025
Head of Sales
IKONO
3-2024 - 10-2024
Head of Sales
The/Studio
9-2022 - 3-2024
Head of SMB Sales
Juni
4-2022 - 9-2022
Inside Sales Manager
Juni
In the press

Media appearances

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Education
2017 - 2018
Master's Business Administration (MSc)
University of Amsterdam
2014 - 2017
Bachelor's degree
Stony Brook University
Social presence
in
Behavioral profile

DISC profile (public)

DISC behavioral profile

Dominance, influence, steadiness, and calculativeness scores with guidance on how this person prefers to communicate and decide.

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