About
About
We are a team of seasoned Penetration Testers and Security Researchers, renowned for our expertise in offensive cybersecurity. Unlike traditional firms, we don’t rely on a conventional sales team; instead, most of our work comes through word-of-mouth referrals, a testament to our reputation for excellence.
Our team members bring diverse skill sets and backgrounds, including experience in Big Tech, finance, and government intelligence sectors, enabling us to deliver comprehensive security solutions. Over the years, we have conducted hundreds of penetration tests worldwide, uncovering and reporting thousands of critical and high-severity vulnerabilities through client engagements and bug bounty programs.
We pride ourselves on delivering actionable insights to strengthen your security posture.
Founder
The founder of our group is Martin Voelk.
Martin is a seasoned IT Security professional with over 25 years of experience in the IT industry. In 2009, he founded Cyber 51, a pioneering IT Security consulting firm, which was acquired by a U.S. company in October 2018.
Before founding Cyber 51, Martin taught Penetration Testing and Cisco-authorized Security Courses. He frequently collaborated with governments and businesses to establish robust security policies, conduct ethical hacking and penetration testing, and secure network infrastructures by addressing and remediating identified threats.
Over the years, Martin has provided IT security consultancy services to a wide array of organizations, including German Railways Group, Cable & Wireless, Hypo-Vereinsbank, Motorola, Fast Lane, Cisco Systems, Apple, the U.S. Army, the British Army, Uber Inc., and numerous other government and private sector entities.
A regular speaker at cybersecurity conferences, Martin has also worked with the media to raise awareness of pressing IT Security issues. In July 2013, he delivered a live hacking demonstration at a conference in Jamaica attended by senior Jamaican government officials and board members from leading Caribbean banks. In 2025 he received an invite from the President’s office of the United Republic of Tanzania to consult on API and AI/ML Penetration Training.
As of 2025, Martin is contracted with Uber Inc., focusing on large-scale penetration testing, application vulnerability discovery, and risk management, bringing his extensive expertise to bolster security in one of the world’s leading technology companies.
Before founding Cyber 51, Martin taught Penetration Testing and Cisco-authorized Security Courses. He frequently collaborated with governments and businesses to establish robust security policies, conduct ethical hacking and penetration testing, and secure network infrastructures by addressing and remediating identified threats.
Over the years, Martin has provided IT security consultancy services to a wide array of organizations, including German Railways Group, Cable & Wireless, Hypo-Vereinsbank, Motorola, Fast Lane, Cisco Systems, Apple, the U.S. Army, the British Army, Uber Inc., and numerous other government and private sector entities.
A regular speaker at cybersecurity conferences, Martin has also worked with the media to raise awareness of pressing IT Security issues. In July 2013, he delivered a live hacking demonstration at a conference in Jamaica attended by senior Jamaican government officials and board members from leading Caribbean banks. In 2025 he received an invite from the President’s office of the United Republic of Tanzania to consult on API and AI/ML Penetration Training.
As of 2025, Martin is contracted with Uber Inc., focusing on large-scale penetration testing, application vulnerability discovery, and risk management, bringing his extensive expertise to bolster security in one of the world’s leading technology companies.
Penetration Testers and Security Researchers
Our team consists of highly experienced professionals, each with over a decade of expertise in offensive security across diverse sectors, including both government and private industry.
Collectively, we hold the highest vendor and government certifications, with many team members maintaining active government clearance levels. We adhere to industry-recognized penetration testing compliance standards, ensuring every engagement meets the highest benchmarks of quality and reliability.
We take a unique approach to team building, favoring individuals we’ve worked with extensively or have trusted professional relationships with. For us, integrity and good faith are as critical as technical expertise, forming the foundation of our operations and client engagements.
We take a unique approach to team building, favoring individuals we’ve worked with extensively or have trusted professional relationships with. For us, integrity and good faith are as critical as technical expertise, forming the foundation of our operations and client engagements.
Penetration Testing & IT Security Certifications
- Offensive Security Certified Expert (OSCE)
- Offensive Security Web Expert (OSWE)
- Offensive Security Certified Professional (OSCP)
- Offensive Security Wireless Professional (OSWP)
- Burp Suite Certified Practitioner (BSCP)
- Licensed Penetration Tester (LPT – EC-Council)
- Certified Ethical Hacker (CEH – EC-Council)
- Certified Security Analyst (ECSA – EC-Council)
- Computer Hacking Forensic Investigator (CHFI – EC-Council)
- Certified Information Systems Security Professional (CISSP – ISC)
- GIAC Certified Forensics Analyst (GCFA)
- GIAC Exploitation Researcher & Advanced Penetration Tester (GXPN)
- GIAC Reverse Engineering Malware (GIAC GREM)
- Certified Network Pentester (CNPen)
- Certified AppSec Pentester (CAPen)
- Certified AppSec Pentesting Expert (CAPenX)
- Certified API Pentester (CAPIPen)
- Certified AI/ML Pentester (C-AI/MLPen)
- Certified Mobile Pentester (CMPenAndroid)
- Certified Mobile Pentester (CMPen-iOS)
- Certified Cloud Pentesting eXpert-AWS (CCPenX-AWS)
References
Due to the sensitive nature of our services, many of our clients prefer to remain anonymous, and we fully respect and comply with their confidentiality requirements.
However, we are proud to have numerous satisfied clients across various countries and industries who are willing to serve as references. Upon request, we can facilitate a secure communication channel to connect you with these reference clients. Please don’t hesitate to contact us for more information.
However, we are proud to have numerous satisfied clients across various countries and industries who are willing to serve as references. Upon request, we can facilitate a secure communication channel to connect you with these reference clients. Please don’t hesitate to contact us for more information.
Why Us?
- Real Pen Testing - not automated scanning!
- Expert Penetration Testers with 10+ years of ethical hacking experience
- Leveraging Bug Bounty experience in our Penetration Tests
- Penetration Testers certified to highest levels such as OSCE, OSCP, OSWE, GIAC, Burp, SecOps
- Experience across all industry and government sectors
- We are an independent third party concerned with finding & fixing flaws
- No conflict of interest. We are not embedded with HW/SW vendors