IT & Security Engineer with Cloud & Incident Response Expertise

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

Excellent customer service and technical support

Security Tools: Zscaler, Zscaler DLP, Qualys, Carbon Black, Akamai, MS Defender, Azure AD, Palo Alto

Worked with external vendors: Apple Care, Dell Direct, Qualys, Akamai, VMWare, Carbon Black, Microsoft

VPN: Zscaler, AnyConnect

Ticketing Systems: ServiceNow, Jira

Security Monitoring & Incident Response

Vulnerability Assessment & Risk Remediation

Compliance Audits (PCI) & Documentation, GAP Analysis, PCI-DSS, Security Standard Artifacts, NIST Frameworks

Process Documentation & Workflow Optimization

Excellent written and verbal communication, with ability to speak in layman terms to ensure customer understanding

Endpoint Management: SCCM, JAMF, Intune

Cloud Security Support

Microsoft Hyper-V, VMware, Runway

Agile, with experience in the SCRUM

Professional Experience

Security Engineer I

Expedia Group 2023 – 2025

Deploy, configure, and maintain security tools (Data Loss Prevention, 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.

Worked with GRC aintain and update security policies, standards, and documentation.

Worked with Akamai support team to assist at times to ensure proper settings for property protection

Familiarity with Akamai control center for troubleshooting DDos and BOT attacks

Lead calibration meetings with senior engineers, architects, and members of other teams.

Participate in security reviews and compliance audits.

Worked with teams to ensure proper Qualys configuration to complete PCI scans

Participated in sprint reviews providing thorough updates on deliverables

Service Desk Analyst II

HomeAway / Vrbo / Expedia Group 2018 – 2023

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

Provided software application troubleshooting, configuration, and support.

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

Used InTune to manage system compliance, Active Directory, system imaging and remote wipes

Ensured encryption and security compliance for endpoint systems.

Supported audiovisual equipment for remote conferencing BlueJeans, and Cisco.

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

Developed process documentation to streamline team operations.

Trained company new hires on systems, tools, and resources.

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.

Performed inspections in accordance with NAV- QA/QC requirements

Trained junior sailors to become Plane Captains

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

Zero Trust Certified Architect (ZTCA)Zero Trust Certified Architect (ZTCA). ZscalerZscalerIssued Jun 2023 · Expires Jun 2026Issued Jun 2023 · Expires Jun 2026Credential ID ujdc45fbfgx2

Akamai Web Application & API Protection. Akamai Technologies July 2023

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