Jan Mazur
Production Engineer at Meta
London, England, United Kingdom
Summary
👤
Senior🎓
Top SchoolJan Mazur is a production engineer with 10 years of experience building and securing large-scale developer infrastructure, currently working on EdenSCM at Meta to power one of the world’s largest monorepos. Grounded in theoretical computer science (MS/BS), he blends rigorous academic training with hands-on systems work in source control, access control, and observability. His open-source contributions include ACL enforcement and commit logging for Facebook's Sapling and ongoing security-focused enhancements to pwndbg, reflecting a rare crossover between production reliability and reverse-engineering tooling. Based in London, he brings proven experience shipping backend security features at scale and improving developer workflows. Colleagues rely on him for pragmatic, auditable solutions that balance performance and safety in complex distributed systems.
10 years of coding experience
Bachelor of Science - BS, Computer Science, Bachelor of Science - BS, Computer Science at Uniwersytet Wrocławski
Polish, English, German
Github Skills (22)
pwd10
debugging10
back-end-development10
python10
acl10
dbg10
security10
gdb10
exploit10
access-control-list10
access-control10
rust10
reverse-engineering10
filesystem9
file-operations9
Programming languages (14)
Github contributions (5)
facebook/sapling
Sep 2020 - Sep 2022
A Scalable, User-Friendly Source Control System.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:154 commits, 3 PRs, 3 comments in 2 years
Contributions summary:Jan primarily contributed to the `facebook/sapling` source control system by adding and modifying code related to access control lists (ACLs). They implemented per-repository ACL checking within the `ConnectionSecurityChecker` and related security components. The changes involved adding checks to restrict access to different repositories. The user also worked on logging commits with changeset IDs to scribe for improved tracking.
control-systemscalablesource-controluser-friendly
pwndbg/pwndbg
May 2019 - May 2020
Exploit Development and Reverse Engineering with GDB & LLDB Made Easy
Role in this project:Security Engineer
Security EngineerContributions:6 commits, 6 PRs, 7 comments in 1 year
Contributions summary:Jan primarily contributes to the pwndbg project, which focuses on exploit development and reverse engineering. The user enhances and maintains the debugging tools and features, including adding commands for memory manipulation and debugging, and integrating with the underlying GDB environment for vulnerability analysis. Key contributions involve adding functionalities, modifying existing commands, and refining the tools for use with debugging symbols.
exploitgdblldbreverse-engineeringpython
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