We love what we do... and it shows

Veteran cyber security consultants

TwelveSec was founded in 2012 in Athens, Greece by a group of Cybersecurity enthusiasts. Since day one the company moto has been that “our work will do our marketing for us” and apparently it has. Using our references and our happy clients, as our salespersons, we have partnered up with several Forbes Global 2000 companies, government agencies, and intergovernmental organisations from around the globe to secure their information from external and internal threats.


In our eyes it doesn’t matter if you are a huge organisation or a small mom and pop store. No problem is too small or too big for us, we simply enjoy the challenge. We try to integrate with your organisation and become part of your team. We won’t be “another vendor” for you; we will be your partner… your cybersecurity partner!


TwelveSec is a team focused in providing the best possible cyber security services to the global market. Our cyber security consultants are amongst the elite and our management is dedicated into providing them the ideal working environment so the only thing they would have to pay attention is our customer’s requests.

Yiannis Koukouras

Managing Director

Yiannis is seasoned cybersecurity veteran, with more than 16 years of field experience.

George Karagiannidis

Chief Science Officer

George is hardened penetration tester and red-teamer who now manages an elite white hat hacking force.

Michael Poultsakis

Chief Operations Officer

Michael’s responsibilities vary in TwelveSec’s business offerings. His experience in penetration tests and security assessments allows him to understand customer needs.

Xenofon Vassilakopoulos

Senior Information Security Consultant

A seasoned pen-tester and Cyber Security Professional with many years of working experience in the
Cyber Security Industry.

Phil Kaloheretis

Finance & Administration Officer

Through Phil’s experience in corporate management our hackers will only need to focus on one thing: hacking!


United Kingdom Accreditation Service
United Kingdom Accreditation Service
NATO - OTAN Security Clearance
European Union Security Clearance
Greece Security Clearance