Sean Kooyman
Software Security Consultant at Self
Johnson City-Kingsport-Bristol Area United States
Summary
👤
Senior🎓
Top SchoolSean Kooyman is a pragmatic Software Security Consultant with 11 years of experience building and securing full-stack web applications, integrations, and bespoke tooling. He blends hands-on development—Python/Django backends, web frontends, integration adapters and Chrome/Outlook extensions—with security expertise informed by a GIAC GWAPT certification and extensive source-code reviews. Comfortable leading small teams, he has acted as CTO and product lead, translating stakeholder needs into roadmaps while removing blockers so teams can iterate quickly. Sean favors the right tool for the job rather than dogma, and often solves problems through process, mentoring, or documentation as readily as with code. His background includes rebuilding legacy COBOL forecasting systems into modern Django applications and shipping payment and POS integrations at scale, reflecting a knack for untangling messy, high-risk systems. Based in the Johnson City–Kingsport–Bristol area, he consults independently, often stepping into urgent remediation and short-deadline delivery roles.
11 years of coding experience
10 years of employment as a software developer
GIAC Web Application Penetration Tester Certification, Pass, GIAC Web Application Penetration Tester Certification, Pass at GIAC GWAPTBachelor of Science (BS), Computer Science, Bachelor of Science (BS), Computer Science at California State University-San Bernardino
Github Skills (121)
duplicates10
backend10
user-input10
email-validation10
mailbox10
ats10
smtp10
indieweb10
email-verification10
email-address10
dfinity10
location9
phonegap-plugin9
rust9
minecraft9
Programming languages (12)
Github contributions (5)
emeth-/hackathon-kit
Jun 2015 - Nov 2018
Contributions:1 PR, 44 pushes, 1 branch in 3 years 6 months
HistoricalChristianFaith/Website-Interface
Dec 2022 - Feb 2025
https://historicalchristian.faith/
Contributions:3 PRs, 56 pushes, 5 branches in 2 years 2 months
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