John Mackender
Senior Security Engineer Architect at Arthur J. Gallagher and Co.
Gilberts, Illinois, United States
Summary
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SeniorJohn Mackender is a Senior Security Engineer/Architect with 30+ years of hands-on experience designing and operating resilient, enterprise-grade network and security infrastructures. Based in Gilberts, Illinois, he currently shapes information security strategy at Arthur J. Gallagher, having led global implementations of IBM QRadar, Broadcom Secure Web Gateway, CyberArk upgrades, and migrations to Zscaler across multi-region and multi-cloud environments. Known for bridging technical delivery with business value, he has repeatedly recaptured costs (notably a $1.3M MSSP in-sourcing win) while mentoring SOC teams and serving as an escalation point for incidents and audits. His background spans large retail, airline, and manufacturing firms where he consolidated security platforms, engineered high-availability architectures, and drove policy and PCI/SOX compliance efforts. Colleagues rely on him for pragmatic roadmaps that balance tactical needs with multi-year maturity planning and M&A security vetting.
10 years of coding experience
9 years of employment as a software developer
German
Stackoverflow
176reputation
4kreached
6answers
16questions
Github Skills (89)
firefox9
testing9
chrome9
java9
static-site-generation9
functional-java9
test-automation8
webkit8
chromium8
cadence8
javascript8
golang8
automation8
e2e-testing8
business-logic8
Programming languages (9)
Github contributions (5)
ManageMC/ManageMC
Aug 2022 - Apr 2023
Public resources for ManageMC
Contributions:22 reviews, 62 PRs, 81 pushes in 7 months
JacobCrofts/phase-0
Oct 2015 - Nov 2015
Contributions:8 PRs, 187 pushes, 11 branches in 1 month
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