Alfred Castillo

Motivated cybersecurity student and United States Navy veteran with experience in leadership, maintenance operations, precision manufacturing, security operations, and technical troubleshooting. Proven ability to supervise teams, manage mission-critical maintenance programs, and operate in high-pressure environments aboard naval vessels and submarines. Skilled in cybersecurity fundamentals, network defense, vulnerability assessment, incident response, Linux/Windows administration, and security analysis tools. Seeking opportunities in cybersecurity, IT support, defense contracting, or technical operations.

Manufactured and repaired mission-critical mechanical components using precision machining equipment including lathes, milling machines, band saws, drill presses, engravers, and fabrication tools.

• Supported operational readiness aboard multiple naval ships and submarines through precision manufacturing and maintenance support operations.

• Supervised a 30-person maintenance work center, assigning weekly maintenance actions, monitoring progress, and ensuring timely completion of required repairs and inspections.

• Maintained detailed maintenance logs, work documentation, and accountability records in accordance with Navy operational standards.

• Served as Maintenance Supervisor responsible for coordinating personnel, prioritizing workload, and overseeing preventive and corrective maintenance operations.

• Led shipboard emergency response teams as Fire Team Leader and Fire Scene Leader during firefighting and casualty control drills and operations.

• Directed multiple emergency response teams simultaneously during high-pressure scenarios requiring rapid coordination and decision-making.

• Conducted training on machine safety, workplace hazard prevention, and proper use of personal protective equipment (PPE).

• Qualified for armed security watchstanding using a 9mm service weapon for ship and pier security operations.

• Served as a drone defense operator responsible for assisting in counter-drone security readiness operations.

• Held a Secret Security Clearance (Expired).Standardized Local Administrator Privilege Removal and Controlled Elevation Framework

• Participated in a Scrum-based cybersecurity capstone project focused on implementing least-privilege security architecture and controlled privilege elevation workflows.

• Assisted in designing security policies aligned with NIST and CIS Controls frameworks.

• Developed recommendations for centralized endpoint management, auditing, and access control monitoring.

Threat Assessment and Mitigation Strategy Project

• Conducted cybersecurity risk assessments involving ransomware, phishing, insider threats, and supply chain vulnerabilities.

• Developed mitigation strategies using industry best practices and NIST security guidance.

• Analyzed network segmentation, incident response planning, and enterprise security architecture.

• CompTIA Security+ (In Progress)
• MR “A” School — United States Navy
• Work Center Supervisor Qualification
• Maintenance Supervisor Qualification
• Fire Team Leader Qualification
• Fire Scene Leader Qualification
• Armed Security Watch Qualification

• United States Navy Veteran
• Secret Security Clearance (Expired)
• Experience working aboard ships and submarines
• Strong leadership and team management background
• Familiar with Agile/Scrum project workflows
• Eligible to work in the United States