Mariusz Zaborski
Security Expert at 4Prime | IT Security
Warsaw, Masovian Voivodeship, Poland
Summary
🤩
Rockstar🎓
Top SchoolMariusz Zaborski is a security-focused software engineer and engineering manager with 12 years’ experience building low-level, OS-level and infrastructure security solutions from Warsaw. He leads teams that design and ship privileged access and session management systems—having driven development, QA and architecture for what his employers call a leading PAM appliance. A long-time FreeBSD committer and contributor to high-profile open-source projects like OpenZFS, Google’s sandboxed-api and FreeRDP, he combines kernel- and filesystem-level expertise with practical sandboxing and hardening work. His contributions include sandboxing diverse C/C++ libraries, ZFS reliability and cross-platform bootloader integrations, and NTLM robustness fixes—signaling a rare blend of systems depth and security pragmatism. Comfortable both writing tight C and managing cross-functional teams, he often focuses on memory safety and isolation techniques that are easy to overlook but critical in production.
12 years of coding experience
8 years of employment as a software developer
Engineer's degree, Computer Science, Engineer's degree, Computer Science at Warsaw University of Technology
Github Skills (30)
sandbox10
filesystem10
security-hardening10
c-language10
rdp10
c-programming10
c1110
ntlm10
security10
c1710
zfs10
free-rdp10
codesandbox10
cpp10
cprogramming-language10
Programming languages (10)
Github contributions (5)
google/sandboxed-api
Jan 2022 - Mar 2022
Generate sandboxes for C/C++ libraries automatically
Role in this project:
Backend & Security Engineer
Backend & Security EngineerContributions:70 reviews, 32 commits, 30 PRs in 2 months
Contributions summary:Mariusz's contributions primarily involve sandboxing and integrating various libraries, including ZStandard, Hunspell, Zopfli, C-Blosc, libzip, and uriparser. They implemented sandboxed environments for these libraries, enhancing the security of the `google/sandboxed-api` repository by isolating the functionalities of these external dependencies. The user's work involved adding tests to verify the correct functioning of these sandboxed libraries, ensuring the project's integrity. Additionally, there were efforts to optimize the memory handling during the sandboxing process.
sandboxingsapicppcplusplus-17apache-license-2
FreeRDP/FreeRDP
May 2015 - Dec 2018
FreeRDP is a free remote desktop protocol library and clients
Role in this project:Back-end Developer
Back-end DeveloperContributions:15 commits, 16 PRs, 13 comments in 3 years 7 months
Contributions summary:Mariusz primarily focused on improving the reliability and stability of the FreeRDP library. Their contributions involved fixing bugs related to system information retrieval, such as hostname and computer name resolution. They also addressed potential security vulnerabilities by adding checks for null pointers and validating data within the NTLM authentication process, improving the robustness of the underlying code. Additionally, they made minor adjustments, such as removing unused variables and fixing comments to enhance code readability and maintainability.
freerdpremote-desktopsdlrdpandroid
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