Senior Network Administrator – TS/SCI Clearance Eligible

Ennoble First Inc.; Gaithersburg (MD); On-site; USD 125,000 - 155,000; Full time

Job summary

Ennoble First is seeking a Senior Network Administrator to support the National Geospatial-Intelligence Agency (NGA) in Gaithersburg, Maryland. You will lead enterprise network design, security, and modernization across LAN/WAN/WLAN, collaborating with agile teams to deliver resilient infrastructure.

This role requires active TS/SCI clearance with polygraph eligibility, strong Cisco routing/switching expertise, and hands-on firewall/VPN experience, plus relevant certifications and security

Qualifications

• Bachelor's degree in Computer Science, Engineering, Information Technology, or related field with 8+ years of experience.
• Active TS/SCI clearance with ability to complete a polygraph.
• 8+ years of network administration experience.
• Security+ and CCNA/CCNP or equivalent certification.
• Experience in large-scale, mission-critical networks.
• Strong Cisco routing/switching expertise.
• Solid understanding of TCP/IP, OSPF/BGP/EIGRP, VLANs, DNS/DHCP, VPN, NAT, QoS, Multicast.
• Experience with enterprise firewalls (Cisco ASA, Palo Alto, Fortinet).
• Experience with network monitoring tools and Agile/Scrum environments.

Responsibilities

• Design, configure, administer, and maintain enterprise LAN, WAN, WLAN, VPN, and data center networks.
• Install and support Cisco routers, switches, firewalls, load balancers, and other network gear.
• Collaborate with Agile Scrum teams for infrastructure enhancements and CI/CD support.
• Participate in sprint planning, backlog refinement, stand-ups, reviews, and retrospectives as networking SME.
• Monitor performance, capacity, and availability; identify optimization opportunities.
• Troubleshoot complex issues; perform root cause analysis and long-term fixes.
• Implement secure network architectures per Intelligence Community security requirements.
• Support cloud connectivity, hybrid networking, and modernization projects.
• Develop and maintain network documentation, diagrams, SOPs, and baselines.
• Coordinate hardware refreshes, maintenance windows, and patch management.
• Partner with cybersecurity teams to address vulnerabilities and support audits.

Skills

Network administration

Cisco routing

TCP/IP

VPN technologies

DNS/DHCP

Security+

CCNA/CCNP

Firewall management

Troubleshooting

Agile/Scrum

Education

Bachelor's degree in Computer Science

Tools

Cisco ASA

Palo Alto

Fortinet

Job description

Ennoble First is seeking a Senior Network Administrator to support the National Geospatial-Intelligence Agency (NGA) in Gaithersburg, Maryland. You will lead enterprise network design, security, and modernization across LAN/WAN/WLAN, collaborating with agile teams to deliver resilient infrastructure.

This role requires active TS/SCI clearance with polygraph eligibility, strong Cisco routing/switching expertise, and hands-on firewall/VPN experience, plus relevant certifications and security