William Grebenik

Professional Profile

William Grebenik

Cybersecurity professional with over 20 years' experience in endpoint security, vulnerability management, and DoD compliance.

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20+

Years in tech

About Me

Professional Summary

Cybersecurity professional with over 20 years of experience supporting government and enterprise environments. Specialized in endpoint security, vulnerability management, and compliance within DoD frameworks. Proven ability to manage, deploy, and optimize security solutions across Windows, Linux, and cloud platforms.

Core strengths

  • Endpoint security & EDR (Microsoft Defender, CrowdStrike)
  • Vulnerability management & remediation (Qualys, Rapid7)
  • SIEM, detection engineering & incident response (Microsoft Sentinel)
  • Cloud security & Zero Trust architecture (Azure)
  • Compliance & audit readiness (NIST, DoD frameworks)
  • Scripting, automation & patch management (PowerShell, PDQ)

Experience

Recent Roles

Vulnerability Management Consultant — Kontio Power, LLC

Jun 2025 – Present

Lead vulnerability management, cloud security, and regulatory compliance efforts.

  • Implemented vulnerability scanning and remediation workflows (Qualys, Rapid7).
  • Built cloud security architecture and DLP/insider-threat mitigations.
  • Supported HIPAA, PCI-DSS and other regulatory controls.

Vulnerability Management Consultant — Robert Half (contract)

Jan 2025 – May 2025

Maintained and improved client vulnerability management programs and reporting.

  • Migrated VM platform and developed zero-day detection/reporting systems.
  • Performed enterprise vulnerability scans and coordinated remediation with IT teams.
  • Developed dashboards and reporting to improve visibility and response.

Senior Cyber Security Engineer — BlackLine Systems, Inc.

Jul 2022 – Oct 2024

Operated detection platforms and managed vulnerability programs for enterprise environments.

  • Administered Microsoft Defender, Sentinel, CrowdStrike, and Rapid7 tooling.
  • Managed alerts, detection rules, and vulnerability remediation workflows.
  • Supported compliance through Purview/Hyperproof and audit readiness activities.

Information Security Analyst — Net2Source Inc.

Nov 2021 – Jun 2022

Supported Becton Dickinson Medical Technology Company's Vulnerability and Threats team in a remote consulting role.

  • Identified and mitigated cyber threats; collaborated across InfoSec teams to drive remediation.
  • Designed reporting and dashboards for vulnerability tracking and executive visibility.
  • Developed Qualys custom dashboards and PowerBI reports to surface critical findings.

Senior Cyber Security Engineer — Edgesource Corporation

Jul 2020 – Oct 2021

Provided IPS/IDS, endpoint, and network defense for the Department of State Air Wing and international customers.

  • Operated Cisco Firepower, WSA, ESA, and ASA appliances and managed policy via FMC.
  • Implemented network and endpoint protections, certificate management, and policy tuning.
  • Supported secure operations and detection across global networks and VMware environments.

Senior Systems Administrator — Raytheon

May 2017 – May 2019

Led system administration, migrations, and infrastructure improvements for large-scale deployments.

  • Implemented and migrated Windows AD, VMware, and server OS upgrades.
  • Managed system configurations, troubleshooting, and process improvements across international sites.
  • Supported high-availability services and cross-team operations during large migrations.

Education

Academic Background

Master of Business Administration

Western Governors University, Salt Lake City, UT

Master of Science in Computer Engineering

Colorado Technical University, Colorado Springs, CO

Bachelor of Science in Computer Engineering

Colorado Technical University, Colorado Springs, CO

Learning focus

  • Cloud security & Zero Trust architecture (Azure)
  • SIEM, detection engineering & analytics (Microsoft Sentinel)
  • Vulnerability management tooling & automation (Qualys, Rapid7)
  • Endpoint protection & EDR optimization (CrowdStrike, Defender)
  • Compliance frameworks and audit readiness (NIST, DoD)
  • Scripting and automation for security operations (PowerShell, PDQ)

Skills

Technical proficiency

Endpoint Security (Microsoft Defender, CrowdStrike) Vulnerability Management (Qualys VMDR, Rapid7) SIEM & Detection (Microsoft Sentinel, Rapid7 InsightIDR) Endpoint Detection & Response (CrowdStrike Falcon) Incident Response & Threat Hunting Cloud Security & Zero Trust (Azure) Compliance & Audit Readiness (NIST, DoD) Automation & Scripting (PowerShell, PDQ) Data Loss Prevention & Insider Threat Network Security (Cisco Firepower, WSA, ASA) Active Directory & Systems Admin (Windows, Linux) Threat Intelligence Integration Detection Engineering & Analytics

Projects

Portfolio highlights

Qualys VMDR & Reporting Dashboards

Built custom Qualys dashboards and PowerBI reports to surface CISA Known Exploited Vulnerabilities and drive remediation tracking.

Vulnerability Management • Reporting • PowerBI

Detection Engineering & Zero-Day Reporting

Developed zero-day detection and reporting systems, integrated threat intelligence into SIEM workflows, and improved telemetry quality.

SIEM • Threat Intelligence • Incident Response

Security Automation & Playbooks

Automated patching and remediation processes using scripting and PDQ, and created repeatable playbooks for vulnerability response.

Automation • Scripting • Remediation

Add more cards here as your portfolio grows. Each card is modular and easy to update.

Contact

Let’s connect

I’m open to new opportunities, contract work, and leadership roles that allow me to deliver strategic digital products.

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