Paul Y.
Remote (US) · Principal Systems Engineer · Demeon LLC
Western Governors University
2 followers
About
Paul Leighton Paul Y. III is a Principal Security Engineer with over 15 years of experience in security architecture, application security, and platform defense within enterprise and regulated environments. He is adept at leading the full security lifecycle, from threat modeling and penetration testing to incident response and secure software development. Paul excels at integrating security into CI/CD pipelines, cloud platforms, and distributed systems by collaborating with engineering, infrastructure, and product teams.
Skills
- Security Architecture
- Application Security
- Threat Modeling
- Penetration Testing
- Vulnerability Management
- Secure SDLC
- Defense-in-Depth
- Cloud Security (AWS)
- Cryptography & PKI Concepts
- Software Supply Chain Security
30 skills in total
Licenses & Certifications
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CISSP
ISC2
Issued Mar 2019 · Expires Feb 2028
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GIAC Certified Incident Handler (GCIH)
GIAC
Issued Jan 2013 · Expires Jan 2029
Experience
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Cybersecurity Consultant / Security Architect
Demeon LLC
Mar 2026 — Present
Pennsylvania, United States
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Principal Systems Engineer
Sierra Nevada Corporation
Nov 2021 — Jan 2026
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Senior Engineer / Security Lead
Booz Allen Hamilton
Jan 2018 — Jan 2021
17 experiences in total
Education
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Western Governors University
M.S., Cybersecurity & Information Assurance
unknown
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Excelsior College
B.S., Information Technology
unknown
4 education entries in total
Recent posts
[celebration:new_certification]Has successfully verified **CISSP** (ISC2) and **GIAC Certified Incident Handler (GCIH)** (GIAC)