Systems Administrator It

DANIEL A. DIAZ

Tucson, ***** AZ

*********@*****.*** / 520-***-****

PROFESSIONAL SUMMARY

Experienced IT Systems Administrator with 15+ years supporting enterprise environments across Windows and Linux platforms. Skilled in infrastructure management, virtualization (VMware, Hyper-V), system monitoring, and team leadership. Holds active DoD Top Secret Clearance and certifications including MCSE, Security+, A+, Network+, and ITIL v3.

COMPUTER SKILLS

Hardware Infrastructure (Servers, SAN, Rack Builds)

Network Management (TCP/IP, DNS, DHCP, VPN)

Adaptability

Windows & Linux Systems Administration

VMware & Hyper-V Virtualization

Communication

System Monitoring & Performance Analysis

Enterprise Tools (Remedy, Maximo, SAP)

Analytical Thinking

Security Management (CompTIA Security+, Firewalls)

Backup & Disaster Recovery

Leadership & Team Management

PROFESSIONAL EXPERIENCE

Sr. Systems Administrator / Raytheon Corporation - Tucson, AZ 11/2018 - Current

Administered Windows and Linux systems with hardware installation, software maintenance, and infrastructure management supporting mission-critical environments under Secret/TS clearance.

Performed system monitoring, diagnostics, outage resolution, and preventative maintenance to ensure continuous operations and rapid recovery.

Collaborated across locations with engineering teams, supported SAP environments, and documented performance trends for enterprise-level maintenance and integration efforts.

Sr. Systems Integration Technologist Lead / Raytheon Corporation - Aurora, CO 11/2010 - Current

Led Windows and Linux administration, managing hardware installations, system maintenance, and infrastructure (racks, servers, appliances) for a secure environment supporting 100+ users.

Directed weekly change control board, performed system monitoring, diagnostics, outage resolution, and performance trend analysis to maintain 99.9% uptime.

Supervised system administrators and collaborated across locations to provide enterprise-level support using VMware ESX 6/7, RHEL, Cisco, HP storage, and Remedy ticketing systems.

Windows Systems Administrator / IBM Corporation - Boulder, CO 05/2010 - 11/2010

Administered Windows 2000–2008 servers for 100–1500 nodes, performing patch management, clustering, OS upgrades, backups, and troubleshooting to maintain optimal system performance.

Managed VMware ESX 3.5 environments, executed server build-outs, virtual migrations, and maintained multi-account virtualization infrastructure.

Resolved and escalated tickets via Remedy, Impact, and Maximo, supporting Cisco network/security devices and ensuring timely issue resolution.

Windows Systems Administrator / IBM Corporation - Boulder, CO 05/2009 - 12/2009

Administered Windows 2000-2008 servers for 100–1500 nodes, performing patch management, OS upgrades, backups, and troubleshooting to ensure 99% system availability.

Managed VMware ESX 3.5 environments, server build-outs, and virtual migrations across multiple client accounts.

Resolved and escalated tickets using Remedy, Impact, and Maximo systems while supporting Cisco network devices and security appliances.

Network Systems Engineer / Stock Development LLC - Naples, FL 07/2005 - 05/2009

Managed 50+ physical/virtual servers, 10 WAN circuits, 8 websites, and 9 domains across 7 branches, ensuring 99.9% network uptime.

Led server/application deployments, Active Directory, Exchange 2003/2007, VMware ESXi, and Citrix XenApp 4.5 administration to support 250+ users.

Reengineered infrastructure for high availability, improving system efficiency by 40% and reducing support tickets via proactive helpdesk reporting.

Network Administrator / Conservancy of SWFL - Naples, FL 08/2004 - 06/2005

Maintained 15 Windows 2000/2003 servers and all network/software infrastructure to ensure 99% system uptime.

Upgraded Exchange 5.5 to 2003/2007 and deployed new file servers, improving email reliability and file access speed by 40%.

Performed backups, installed hardware, and led a small network team in managing a Microsoft-based environment (AD 2003, SQL 2000, Cisco 2600).

Helpdesk/LAN Technician / NCH Hospital Healthcare - Naples, FL 06/2003 - 07/2004

Handled all helpdesk requests, resolving 95% at first contact.

Supported various systems and hardware, boosting uptime by 30%.

Diagnosed and fixed LAN issues, cutting downtime by 25%.

Administration Manager / COSTCO WHOLESALE INC. - Fort Myers, FL 01/1989 - 01/2003

Led admin operations, improving efficiency by 25%.

Supervised 15 staff, boosting productivity by 20%.

Managed budgets and compliance with 100% audit accuracy.

Military Police Officer / US ARMY 01/1983 - 01/1989

Awarded Army Commendation Medal for improving unit readiness by 20%.

Received Good Conduct Medal for 100% compliance over 3 years.

Boosted team efficiency and mission success by 15%.

EDUCATION

Masters of Science Degree: Information Systems Management 01/2010

Hodges University - Fort Myers, FL

Bachelors of Science degree: Computer Information Technology 01/2005

Hodges University - Fort Myers, FL

CERTIFICATION

MCSE 2003, MCP# 6920022

A+, Comptia # COMP001002289989

Net +

Security +

ITIL v3

#HRJ#2f100753-62cd-4123-a648-b5292433ccf4#

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