Patrick Pirker
Co-Founder Pentester Syslifters GmbH
Krems an der Donau, Lower Austria, Austria
Summary
🤩
Rockstar🎓
Top SchoolPatrick Pirker is a cybersecurity professional and co-founder of Pentester Syslifters GmbH with nine years of hands-on experience in offensive security and consulting. He has held roles from IT security analyst to security consultant at companies like Greentube and A1 Digital before launching his own pentesting firm. Patrick combines formal MSc/BS training in IT security with practical expertise in Active Directory attack and defense techniques, contributing security fixes and features to tools such as Certipy. His open-source work includes improving enumeration and abuse tooling (adding technique IDs, JSON output, and new checks) that aid threat assessments and red-team operations. Based in Krems an der Donau, he pairs entrepreneurial drive with deep technical troubleshooting, often focusing on subtle protocol and data-length edge cases. Colleagues know him for translating complex attack research into reliable, usable tooling for clients and the security community.
9 years of coding experience
4 years of employment as a software developer
HTBL Krems - SystemtechnikBachelor of Science - BS, IT-Security, Bachelor of Science - BS, IT-Security at Fachhochschule St Pölten
Github Skills (7)
security-testing10
vulnerability-assessment10
security-scan10
python10
pki10
security10
json9
Programming languages (12)
Github contributions (5)
ly4k/Certipy
Nov 2021 - Nov 2021
Tool for Active Directory Certificate Services enumeration and abuse
Role in this project:
Security Engineer
Security EngineerContributions:6 commits in 5 days
Contributions summary:Patrick primarily contributed to the security analysis and enumeration tool, `certipy`. They addressed a vulnerability related to userPrincipalName length. Their commits added technique IDs from a security paper to the output, providing more context about potential vulnerabilities. Furthermore, the user implemented a JSON output flag, and consolidated vulnerable reasons and implemented a new security check (ESC3).
active-directoryadcspki
Syslifters/PXEThief
Oct 2024 - Mar 2026
Contributions:9 pushes in 1 year 5 months
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