Gustavo Flores
Chula Vista,CA
Summary
Systems Administrator with hands-on experience supporting secure Windows and Linux infrastructure in DoD environments. Skilled in system hardening, STIG implementation, vulnerability remediation, virtualization, server maintenance, imaging, and network services. Experienced with Red Hat Enterprise Linux, Windows Server, VMware ESXi, Active Directory, DNS, DHCP, GPOs, ACAS/Tenable Security Center, SCAP tools, and DISA compliance requirements. Proven ability to troubleshoot mission-critical systems, support secure test and production environments, document technical processes, and collaborate across technical teams to maintain reliable, compliant infrastructure.
Overview
2
2
years of professional experience
1
1
Certificate
Work History
Systems Administrator II
Koam Engineering Systems Inc.
San Diego, CA
05.2024 - Current
- Administer and secure mission-critical DoD infrastructure across Windows Server, Red Hat Enterprise Linux, and virtualized environments.
- Support systems engineering efforts through infrastructure configuration, system maintenance, troubleshooting, and technical support for secure operational environments.
- Build and maintain VMware ESXi virtualized environments used to support secure test, development, and production systems.
- Apply DISA STIG requirements and system hardening procedures to maintain compliance with DoD cybersecurity standards.
- Conduct vulnerability assessments using ACAS scanners and Tenable Security Center to identify, track, and remediate security findings.
- Manage enterprise services including Active Directory, DNS, DHCP, and Group Policy Objects to support user, system, and network operations.
- Perform patching, software updates, and remediation actions to improve system reliability, security posture, and compliance readiness.
- Troubleshoot operating system, hardware, network, and application issues across Windows and Linux environments.
- Maintain technical procedures for system builds, hardening, remediation, and recurring administrative tasks.
- Collaborate with technical teams to resolve infrastructure issues and improve support processes for secure DoD systems.
Systems Administrator II
Centurum
San Diego, CA
12.2023 - 05.2024
- Supported deployment and administration of secure host baseline systems, including Windows Server 2022, Windows 10/11, and Red Hat Enterprise Linux.
- Prepared, imaged, and configured servers and workstations using Windows Deployment Services and PXE boot processes.
- Assisted with implementation of DISA STIG and SCAP-based compliance checks to evaluate system security posture.
- Maintained server rack infrastructure, performed hardware setup, and supported operating system installation and baseline configuration.
- Helped develop and follow system security procedures, standards, and documentation to support audit readiness.
- Supported troubleshooting of Windows and Linux systems, including user access, operating system, application, and configuration issues.
- Participated in IT department meetings to identify service delivery improvements and support operational requirements.
Skills
- Windows Server 2019/2022 Administration
- Windows 10/11 Secure Host Baseline
- Red Hat Enterprise Linux Administration
- VMware ESXi Virtualization
- Active Directory, DNS, DHCP, GPOs
- DISA STIG Implementation
- SCAP Compliance Tools
- ACAS / Tenable Security Center
- Vulnerability Scanning & Remediation
- System Hardening
- Patch Management
- Configuration Management
- Server Rack Installation & Maintenance
- WDS / PXE Imaging
- TCP/IP Networking Concepts
- Switching, Routing, Firewalls, Subnetting
- PowerShell Scripting
- Technical Documentation
- Audit Readiness
- Troubleshooting & Incident Resolution
- DoD Secure Systems Support
Languages
English
Spanish
Certification
- CompTIA Security+ (Exp 03/22/2028)
Timeline
Systems Administrator II
Koam Engineering Systems Inc.
05.2024 - Current
Systems Administrator II
Centurum
12.2023 - 05.2024
Navy Tactical Mission Planning Sub System (T-MPSS) -
Naval Information Warfare Systems Command
MILSATCOM Protected And Wideband Comm Management Training Course -
Naval Information Warfare Systems Command
ADNS K(v)2 -
Information Warfare Training Command
Journeyman Communications Course: Transmission Systems Technician -
Information Warfare Training Command
IT "A" School -
Information Warfare Training Command
Education
Navy Tactical Mission Planning Sub System (T-MPSS) -
Naval Information Warfare Systems Command
San Diego, CAMILSATCOM Protected And Wideband Comm Management Training Course -
Naval Information Warfare Systems Command
San Diego, CAADNS K(v)2 -
Information Warfare Training Command
San Diego, CAJourneyman Communications Course: Transmission Systems Technician -
Information Warfare Training Command
Pensacola, FLIT "A" School -
Information Warfare Training Command
Pensacola, FLClearance
- Active Secret Clearance