RC
RALPH CASTILLO // SEC.OPS
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AVAILABLE FOR ENGAGEMENT — HOUSTON, TX

Ralph
Castillo

IT Senior Cybersecurity Consultant · IT Infrastructure & Security Manager · U.S. Coast Guard Veteran
LOCATIONHouston, TX
PHONE(813) 564-3393
EMAIL[email protected]
LINKEDINr-w-castillo-716420135
Download Full CV (PDF)
01

Professional Summary

Cybersecurity and infrastructure leader with 20+ years securing enterprise, government, and critical infrastructure environments — specialized in hardening and troubleshooting Microsoft 365 Security, Microsoft Defender XDR, and Microsoft Sentinel, alongside Identity & Access Management, incident response, and global IT operations. Proven track record leading multinational teams, securing critical infrastructure, and modernizing enterprise environments across the Americas. Bilingual — English/Spanish.

02

Career Route

A career plotted the way he'd plot any course — from a federal waterway carrying 6% of world trade, through multinational infrastructure command across the Americas, into enterprise cyber defense.

CHARTED 1997 — PRESENT · FOUR WAYPOINTS
Panama Canal Commission Canal Protection Force - Security Systems Specialist 9.08°N 79.68°W · 1997–2003 Frost S.A., Panama Global IT Infrastructure Manager 8.98°N 79.52°W · 2012–2021 IDEA Public Schools Infrastructure & Campus Support Texas · 2021–2023 Catapult / Quisitive IT Security Consultant & Response Houston, TX · 2021–Present
03

Core Competencies

MICROSOFT SECURITY STACK
Microsoft Sentinel (SIEM) Microsoft Defender XDR Defender for Endpoint Defender for Identity Microsoft 365 Security Office 365 Security Microsoft Entra ID Microsoft Exchange Security Conditional Access Azure Security
SECURITY OPERATIONS
Incident Response Threat Hunting Vulnerability Management SOC Operations Risk Management Compliance IAM
INFRASTRUCTURE & PLATFORMS
Office 365 SharePoint Online OneDrive for Business Exchange Online Active Directory Windows Server Intune VMware Docker Hybrid Cloud Infrastructure
04

Professional Experience

IT Security Consultant & Response Specialist Catapult Systems / Quisitive 2021 — PRESENT
  • Architect and deploy Microsoft Sentinel SIEM solutions for enterprise clients.
  • Implement Microsoft Defender XDR controls across hybrid cloud environments.
  • Conduct incident response investigations and proactive threat hunting.
  • Design Zero Trust architectures leveraging Microsoft Entra ID and Conditional Access.
  • Perform security assessments and remediation planning within the Microsoft Office 365 ecosystem.
  • Reduce threat detection and response times through security monitoring optimization.
IT Infrastructure & Campus Support Specialist IDEA Public Schools 2021 — 2023
  • Managed complete technology lifecycle supporting educational campuses and thousands of users.
  • Reduced downtime through proactive infrastructure management and support processes.
  • Implemented security-conscious IT practices in protected educational environments.
Global IT Infrastructure Manager Frost S.A., Panama 2012 — 2021
  • Directed infrastructure and cybersecurity strategy across North, Central, and South America.
  • Led multinational IT teams supporting enterprise operations with 99.9% service availability.
  • Managed infrastructure budgets exceeding $2M and strategic vendor relationships.
  • Implemented virtualization, cloud modernization, and business continuity initiatives.
  • Established governance, security policies, and operational standards.
Security Systems Specialist Panama Canal Commission (U.S. Government) 1997 — 2003
  • Designed and implemented anti-terrorism security systems protecting critical infrastructure.
  • Developed organization-wide security procedures and operational safeguards.
  • Coordinated with U.S. and international agencies on maritime security initiatives.
  • Supported protection of a global trade route handling approximately 6% of world commerce.
05

Certifications & Professional Development

Microsoft AZ-900 — Azure FundamentalsEARNED
Microsoft SC-900 — Security, Compliance & IdentityEARNED
IBM Cybersecurity Analyst Professional CertificateEARNED
Google IT Professional CertificateEARNED
CompTIA A+ CertifiedEARNED
CompTIA Security+EXPECTED 2026
CISSPCANDIDATE · 2026
NYU Tandon — Enterprise & Infrastructure SecurityCOMPLETED
University of London — Information SecurityCOMPLETED
06

Military Service

Petty Officer, U.S. Coast Guard
Honorable Discharge · 1989–1997

Operation Desert Storm veteran, serving with a Port Security Unit / Law Enforcement Detachment. Served as Security Team Leader, coordinating protection of high-value maritime assets.

DECORATIONS National Defense Service Medal
Coast Guard Bicentennial Unit Commendation Ribbon