Ralph Castillo — Senior IT Cybersecurity Consultant

2021 — NOW

IT Security Consultant & Incident Response Specialist

Catapult Systems / Quisitive

Architected Microsoft Sentinel SIEM deployments across enterprise client environments, consolidating fragmented log sources into unified detection pipelines.
Implemented Defender XDR controls across hybrid cloud environments, cutting mean-time-to-detect for key threat categories by 90%.
Led incident response and proactive threat-hunting engagements, containing incidents within target SLA.
Designed Zero Trust architectures with Entra ID and Conditional Access, cutting unauthorized access attempts by 90%.

2021 — 2023

IT Infrastructure & Campus Support Specialist

IDEA Public Schools

Continued part-time through 2023 while transitioning into the Catapult / Quisitive role above.

Managed full technology lifecycle across multiple campuses serving 1,500 students and staff.
Reduced unplanned downtime by 99% through proactive monitoring and standardized support processes.

2012 — 2021

Global IT Infrastructure Manager

Frost S.A., Panama

Directed infrastructure and cybersecurity strategy across North, Central, and South America, sustaining 99.9% availability region-wide.
Led multinational IT teams of 25 engineers across 5 countries, supporting 3,000 end users.
Owned infrastructure budgets exceeding $2M and managed vendor relationships.
Migrated 75% of on-premises workloads to virtualized/cloud infrastructure, cutting infrastructure costs by 85%.

2003 — 2012

General Manager

Action Sports

Oversaw daily operations of a betting facility and its digital platform, ensuring regulatory compliance and profitability.
Managed risk and liability across large-scale betting activity, setting staking limits to protect company assets.

1997 — 2003

Security Systems Specialist

Panama Canal Commission — U.S. Government

Designed anti-terrorism security systems protecting maritime infrastructure handling roughly 6% of global trade volume.
Developed organization-wide security procedures later adopted as standard practice.
Coordinated with U.S. and international agencies on maritime security compliance audits.

1989 — 1997

Petty Officer, U.S. Coast Guard — Honorable Discharge

Operation Desert Storm · Port Security Unit / Law Enforcement Detachment

Served as Security Team Leader coordinating protection of high-value maritime assets during active deployment.
Awards: National Defense Service Medal; Coast Guard Bicentennial Unit Commendation Ribbon.

Ralph Castillo secures the identity layer enterprises run on.