NETWORK ADMINISTRATOR

About the Role

Quantum Research International, Inc. (Quantum) provides services and products in national defense and federal civilian sectors, including:

• Cybersecurity and Information Operations
• Space Operations and Control
• Aviation Systems
• Ground, Air and Missile Defense, and Fires Support Systems
• Intelligence Programs Support
• Experimentation and Test
• Program Management
• Audio/Visual Technology Applications

This position is based in a Sensitive Compartmented Information Facility (SCIF) environment, managing and maintaining virtual and physical IT infrastructure while ensuring compliance with stringent DoD cybersecurity policies and standards.

Responsibilities

• Manage, configure, and maintain network infrastructure in compliance with DoD cybersecurity requirements and SCIF operating standards.
• Configure, administer, and troubleshoot routers, switches, firewalls, VPNs, and other network infrastructure devices.
• Monitor network availability, performance, capacity, and security to ensure reliable and continuous operations.
• Collaborate with the Cybersecurity Team to implement DISA STIG requirements, remediate vulnerabilities, and maintain network security compliance.
• Configure and maintain network services and protocols including TCP/IP, DNS, DHCP, VLANs, routing, switching, NAT, and access control lists (ACLs).
• Diagnose and resolve network connectivity, latency, routing, switching, and performance issues across classified and unclassified environments.
• Administer network authentication and access controls, including Active Directory integration, RADIUS, 802.1X, PKI, and role-based access.
• Configure and maintain firewalls, security policies, network segmentation, and boundary protection controls in accordance with DoD security requirements.
• Support network vulnerability assessments, ACAS scans, patching, configuration management, and remediation activities.
• Maintain network device configurations, firmware, software updates, backups, and recovery procedures.
• Support implementation and maintenance of secure remote-access and site-to-site VPN solutions.
• Perform network traffic and packet analysis using tools such as Wireshark to identify and troubleshoot network and application communication issues.
• Support network infrastructure modernization, lifecycle replacement, and implementation of new network technologies.
• Develop and maintain network diagrams, configuration baselines, standard operating procedures (SOPs), troubleshooting guides, and other technical documentation.
• Support RMF, ATO, inspection, audit, and continuous-monitoring activities by providing required network configuration and security evidence.
• Coordinate with system administrators, cybersecurity personnel, DevSecOps engineers, and external network providers to resolve infrastructure and connectivity issues.
• Respond to network outages and incidents, perform root-cause analysis, and implement corrective actions to minimize operational impact.

Requirements

• Must possess active DoD Secret clearance with the ability to upgrade to TS/SCI.
• Must have experience in installing, testing, and supporting information systems and/or networks.
• Must possess specific experience in administration and/or support of computer operating systems and/or network operating systems.
• Must be able to communicate effectively verbally and in writing.
• Must have and maintain an appropriate DoDI 8570.01-M (Information Assurance Workforce Improvement Program) certification for the appointed duty level.

Skills

• Solid understanding of TCP/IP networking (subnetting, routing, switching, DNS/DHCP, common protocols).
• Hands-on experience managing multiple Palo Alto firewalls — security rules, policies, and zones.
• Experience configuring and troubleshooting Cisco Catalyst 3850/9300 switches.
• Experience with Cisco 4311 (ISR) routers.
• Ability to apply STIGs to network devices and maintain compliance baselines.
• Hyper-V networking: virtual switches, VLAN tagging, and virtual network adapters.
• Experience upgrading Palo Alto and Cisco devices.
• Familiarity with networking packet capture tools.
• Familiarity with standard TCP/UDP ports.
• Creating and maintaining network diagrams and documentation.

Desired Skills

• Understanding of analytics and providing findings in presentations.
• AWS networking: VPCs, subnets, route tables, security groups, NACLs, Transit Gateway, and VPN.
• Terraform / Infrastructure as Code.
• Familiarity with DoD/government compliance processes (audits, hardening, remediation, CTOs).
• Experience with DNS manager.
• Familiarity with SolarWinds SEM/Kiwi Syslog.