Mateusz Jurczyk
Information Security Engineer
Zurich, Zurich, Switzerland
Summary
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RockstarMateusz Jurczyk is an Information Security Engineer with 12 years of deep experience in vulnerability research, reverse code engineering, OS internals, and exploit development, currently working at Google from Zurich. He began his security career in applied pentesting and malware analysis at Hispasec Sistemas, evolving into a researcher who bridges low-level Windows internals with practical defensive measures. Mateusz contributes to notable open-source resources such as the j00ru/windows-syscalls repository, maintaining and expanding Windows system call tables across many versions and architectures. His work reflects a rare combination of hands-on exploit technique knowledge and disciplined mitigation engineering. Colleagues describe him as a methodical investigator who uncovers subtle implementation flaws in complex systems. He frequently leverages C/C++ and Python to produce tooling and analyses that make hidden OS behaviors visible and auditable.
12 years of coding experience
3 years of employment as a software developer
Github Skills (13)
c1710
html10
kernel10
memory-safety10
network-security10
vulnerabilities10
assembly10
c1110
sys10
kernel-mode10
x86-6410
vulnerability10
operating-system10
Programming languages (4)
Github contributions (5)
j00ru/windows-syscalls
May 2018 - Nov 2020
Windows System Call Tables (NT/2000/XP/2003/Vista/7/8/10/11)
Role in this project:
Back-end Developer
Back-end DeveloperContributions:8 commits, 13 pushes, 1 branch in 2 years 5 months
Contributions summary:Mateusz's primary contribution involved adding and updating system call tables for various Windows versions, specifically for the x86-64 architecture. They added new system calls from Windows 10 versions, updating the HTML files containing the tables. Furthermore, the user referenced the repository in other HTML files and fixed syscalls for older Windows NT4 systems. The commits demonstrate a focus on maintaining and expanding the system call information available within the repository.
windowspe-fileinternalswindows-10prebuild
googleprojectzero/DrSancov
Sep 2019 - Sep 2021
Contributions:3 commits, 2 pushes, 1 branch in 2 years
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