IT Security Engineer - Incident Response & Compliance Specialist

Mary Christyne Zeller, MS-ISS

Seguin, TX ***** 512-***-**** ************@*****.***

Summary

Motivated and results-driven IT and Security Engineer with extensive experience in desktop support, system administration, and cybersecurity operations. Skilled in incident response, vulnerability management, cloud compliance, and security tool deployment. Strong collaborator with excellent communication and problem-solving skills, committed to ensuring system security, operational efficiency, and user satisfaction.

Core Competencies

Windows OS / Mac OS / Android / iOS Support

Security Tools: Zscaler, Qualys, Carbon Black, Akamai

Ticketing Systems: ServiceNow, Jira

Security Monitoring & Incident Response

Vulnerability Assessment & Risk Remediation

Compliance Audits (PCI) & Documentation

Process Documentation & Workflow Optimization

Endpoint Management (SCCM, JAMF)

Cloud Security Support

Professional Experience

Security Engineer I

Expedia Group 2023 – Present

Deploy, configure, and maintain security tools (DLP, Firewall/WAF, SIEM/SOAR, Endpoint Security).

Monitor and analyze security alerts; assist in incident response activities.

Conduct vulnerability assessments and assist with risk remediation.

Support cloud compliance efforts, access reviews, and security reporting.

Maintain and update security policies, standards, and documentation.

Participate in security reviews and compliance audits.

Service Desk Analyst II

HomeAway / Vrbo / Expedia Group 2018 – 2023

Provided advanced hardware and software support for Lenovo, Mac, iOS, and Android devices.

Managed tickets using Jira and ServiceNow; imaged systems via SCCM and JAMF.

Ensured encryption and security compliance for endpoint systems.

Supported audiovisual equipment for remote conferencing (BlueJeans).

Participated in PCI audits; documented and tracked security compliance efforts.

Developed process documentation to streamline team operations.

Trained alongside Security Engineering teams to expand security tool knowledge.

Completed supplemental training in Linux and Python via Udemy.

Senior Systems Analyst

Huston-Tillotson University 2015 – 2018

Provided Tier II/III technical support across campus systems and network infrastructure.

Managed device imaging, peripheral configuration, and Cisco switch setups.

Supported local and wide area networks, VoIP telephony, and datacenter maintenance.

Oversaw disaster recovery processes and maintained network security.

Managed Active Directory and Exchange 2010 accounts.

Supervised and mentored student IT workers.

Managed vendor relationships and technology purchasing.

Aviation Machinist Mate (AD)

United States Navy San Diego, CA

Maintained and repaired aircraft engines and fuel systems.

Performed diagnostic testing and engine performance evaluations.

Education

Master of Science, Information Systems Security

Our Lady of the Lake University San Antonio, TX May 2019

Bachelor of Liberal Arts, Administrative Leadership (Honors)

University of Oklahoma Norman, OK Dec 2016

Bachelor of Science, Computer Engineering Technology

Coleman College La Mesa, CA May 2002

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