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Efthymios Kelesmitos Email & Phone Number

Penetration Tester | OSCP | CRTO | Cisco CyberOps Associate at NVISO Security
Location: Thessaloniki Metropolitan Area, Greece, Greece 3 work roles 2 schools
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✓ Verified May 2026 3 data sources Profile completeness 86%

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Current company
NVISO Security
Role
Penetration Tester | OSCP | CRTO | Cisco CyberOps Associate
Location
Thessaloniki Metropolitan Area, Greece, Greece
Company size
100 employees

Who is Efthymios Kelesmitos? Overview

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Quick answer

Efthymios Kelesmitos is listed as Penetration Tester | OSCP | CRTO | Cisco CyberOps Associate at NVISO Security, a company with 100 employees, based in Thessaloniki Metropolitan Area, Greece, Greece. AeroLeads shows a matched LinkedIn profile for Efthymios Kelesmitos.

Efthymios Kelesmitos previously worked as Penetration Tester at Nviso Security and Red Teamer at Hellenic Air Force (Haf). Efthymios Kelesmitos holds Bachelor'S Degree, Computer Science from International Hellenic University.

Company email context

Email format at NVISO Security

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NVISO Security

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Profile bio

About Efthymios Kelesmitos

Penetration tester. My proficiency extends to both Windows and Linux systems, and I actively engage in Capture The Flag (CTF) competitions, demonstrating a keen interest in offensive security and ethical hacking. I participate in various platforms, such as HackTheBox and Tryhackme, to refine and apply my skills.

Current workplace

Efthymios Kelesmitos's current company

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NVISO Security
Nviso Security
Penetration Tester | OSCP | CRTO | Cisco CyberOps Associate
brussels, brussels hoofdstedelijk gewest, belgium
Website
nviso.be
Employees
100
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3 roles

Efthymios Kelesmitos work experience

A career timeline built from the work history available for this profile.

Red Teamer

Hellenic Air Force (Haf)

Stationed at the Directorate of Cyber Defense within the Hellenic National Defense General Staff.

Oct 2023 - Sep 2024

L1 Soc Analyst

Encode Is Now Obrela Corporation

Athens Metropolitan Area

  • Continuously monitoring the security alerts queue
  • Triaging security alerts by conducting investigations using QRadar, Sentinel, and EDRs (Falcon Insight, ATP, Carbon Black)
  • Collecting data and context required to create incident cases and initiate Level 2 escalation
Sep 2022 - Sep 2023
Team & coworkers

Colleagues at NVISO Security

Other employees you can reach at nviso.be. View company contacts for 100 employees →

IS Iliana Sampelidou Iliana Sampelidou Colleague at Nviso Security Greece, Greece View → LA Luca Asmus Luca Asmus Colleague at Nviso Security Biberach An Der Riß, Baden-Württemberg, Germany, Germany View → MA Maria Argyriou Maria Argyriou Colleague at Nviso Security Greece, Greece View → RD Robin De Pril Robin De Pril Colleague at Nviso Security Brussels Metropolitan Area, Belgium View → MV Milan Velle Milan Velle Colleague at Nviso Security Hoeilaart, Flemish Region, Belgium, Belgium View → FT Fiona Trimi Fiona Trimi Colleague at Nviso Security Greece, Greece View → AK Anestis Kostopoulos Anestis Kostopoulos Colleague at Nviso Security Greece, Greece View → RD Ryan Depoorter Ryan Depoorter Colleague at Nviso Security Belgium, Belgium View → LM Laurent Marlier Laurent Marlier Colleague at Nviso Security Nivelles, Walloon Region, Belgium, Belgium View → ES Enes Saritepeci Enes Saritepeci Colleague at Nviso Security Germany, Germany View →
2 education records

Efthymios Kelesmitos education

FAQ

Frequently asked questions about Efthymios Kelesmitos

Quick answers generated from the profile data available on this page.

What company does Efthymios Kelesmitos work for?

Efthymios Kelesmitos works for NVISO Security.

What is Efthymios Kelesmitos's role at NVISO Security?

Efthymios Kelesmitos is listed as Penetration Tester | OSCP | CRTO | Cisco CyberOps Associate at NVISO Security.

Where is Efthymios Kelesmitos based?

Efthymios Kelesmitos is based in Thessaloniki Metropolitan Area, Greece, Greece while working with NVISO Security.

What companies has Efthymios Kelesmitos worked for?

Efthymios Kelesmitos has worked for Nviso Security, Hellenic Air Force (Haf), and Encode Is Now Obrela Corporation.

Who are Efthymios Kelesmitos's colleagues at NVISO Security?

Efthymios Kelesmitos's colleagues at NVISO Security include Iliana Sampelidou, Luca Asmus, Maria Argyriou, Robin De Pril, and Milan Velle.

How can I contact Efthymios Kelesmitos?

You can use AeroLeads to view verified contact signals for Efthymios Kelesmitos at NVISO Security, including work email, phone, and LinkedIn data when available.

What schools did Efthymios Kelesmitos attend?

Efthymios Kelesmitos holds Bachelor'S Degree, Computer Science from International Hellenic University.

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