Constantine Spentzos

Galvanizer
DISC Type : Id

Head of Business Development at Proton

Greater Madrid Metropolitan Area, Spain

Overview

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.

Personality Overview

Trusting

Pragmatic

Socially Adept

They are more likely to be open to unproven but exciting technologies.  They respond better to a combination of speed and relationship. They are charming and have the ability to align others behind their decisions.

Topics They Care 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.
SMB Workflow
He specializes in helping Small and Medium-sized Businesses (SMBs) streamline their digital workflows with unified, privacy-first solutions.

Media Appearances

Constantine has no verified media appearances

Work History

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

Education

2017 - 2018
Master's Business Administration (MSc) from University of Amsterdam
2014 - 2017
Bachelor's degree from Stony Brook University

More Information

Social Presence :

Prographics :

Exp : 4 Location : Greater Madrid Metropolitan Area, Spain Job Level : Mid-senior Designation : Head of Business Development at Proton
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Insights For Selling To Constantine

During A Call Or A Meeting

DO's

  • Invite them for a lunch or a drink/coffee
  • Use words like ‘partner’, ‘together’, ‘impact’ etc.
  • Focus on building a relationship, it can play a key role in their decision making

DONT's

  • Don’t hesitate from asking questions, but take a friendly and warm approach
  • Don’t make promises that are hard to keep
  • Do not come across as negative or non-supportive, work with them as a partner

When Cold Calling

When Writing An Email

While Negotiating & Closing

    The secret to closing fast with Constantine is

  • Relationship and product conviction matter equally, followed by a sense of achievement.
  • Will you ever get a clear answer from Constantine

  • If they are not convinced, they will say no albeit in a friendly manner.


Insights For Deal Planning

    How fast (or slow) will Constantine move?

  • They can reach decisions quickly if they develop trust and confidence in the product.
  • Can Constantine take some risk or not?

  • They can take risks if necessary.

You And Constantine

Personality Compatibility


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