Jacob Gajek
Principal Security Researcher at eSentire
Mississauga, Ontario, Canada
Summary
👤
Senior🎓
Top SchoolJacob Gajek is a Principal Security Researcher with over a decade of hands-on experience turning adversarial "ground truth" into actionable defensive intelligence at eSentire. He blends deep systems-level engineering—demonstrated by significant contributions to the widely used Cuckoo Sandbox, including a vSphere/ESXi machinery module and memory dump support—with practical incident-driven research. Trained in physics and astronomy with a computer science minor from the University of Toronto, he brings a scientific rigor and curiosity to threat analysis and malware behavior. Based in Mississauga, Ontario, Jacob excels at bridging research, tooling, and production security to harden environments against sophisticated threats. An often-overlooked strength is his knack for refactoring and robust error handling, which turns brittle analysis pipelines into reliable, maintainable systems.
12 years of coding experience
Hon.B.Sc., Major: Astronomy, Physics | Minor: Computer Science, Hon.B.Sc., Major: Astronomy, Physics | Minor: Computer Science at University of Toronto - Victoria University
Github Skills (7)
malware10
python10
anti-malware10
pyvmomi10
system-design9
ssl8
http-request8
Programming languages (4)
Github contributions (5)
cuckoosandbox/cuckoo
Jul 2015 - Sep 2016
Cuckoo Sandbox is an automated dynamic malware analysis system
Role in this project:
Back-end Developer & System Architect
Back-end Developer & System ArchitectContributions:14 commits, 8 PRs, 35 comments in 1 year 1 month
Contributions summary:Jacob significantly contributed to the `cuckoo` project, which is a dynamic malware analysis system. Their primary focus was on developing a new machinery module for vSphere/ESXi, including memory dump support. They addressed PEP-0476 SSL certificate verification issues and improved error handling within the vSphere module. The user also refactored the code, fixed memory dump download functionality, and added a start() procedure for task initiation.
malware
eSentire/nmap-esentire
Jun 2015 - Mar 2016
Contributions:42 commits, 2 PRs, 36 pushes in 10 months
network-scannernmapscannersecurity-toolsbugbounty
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