Senior Network Administrator - TS/SCI with Polygraph

General Dynamics Information Technology; Washington (District of Columbia); On-site; USD 124,000 - 161,000; Full time

Benefits offered by this job

Comprehensive benefits and wellness

401K with company match

Competitive pay and paid time off

Job summary

General Dynamics Information Technology (GDIT) is seeking a Network Computer Systems Administrator to install, configure, and manage enterprise LAN/WAN infrastructure for government networks. You will handle routers, switches, firewalls, and VPNs while designing and building new network environments and ensuring security.

The role emphasizes DoD requirements, collaboration with engineering teams, and on-site work in Washington, DC, with a compensation range reflecting DoD/Intelligence sector

Qualifications

• Required Education and Experience: Technical Training, Certification(s) or Degree + 8 years
• Certifications: DoD 8570.01-M at IAT Level II and CCNA minimum; CCNP preferred
• Security Clearance Level: Active TS/SCI with Polygraph
• Location: 100% On-Site required
• Strong knowledge of OSPF, RIP, and BGP routing protocols
• Knowledge of standard ACLs for security and traffic filtering
• Strong knowledge of Cisco routing and switching technologies
• VLAN design, trunking, inter-VLAN routing, STP/RSTP/MST management
• Experience with EtherChannel/LACP for redundancy
• Ability to configure and manage Cisco ASA appliances
• Knowledge of VPN technologies and secure remote access
• Familiarity with DoD/DISA STIGs and security baseline enforcement
• Ability to work independently and drive tasks to completion

Responsibilities

• Install, configure, and maintain enterprise LAN/WAN infrastructure, including routers, switches, firewalls, and VPNs.
• Independently design and build new network environments, including topology, configuration, and architecture planning.
• Configure and troubleshoot dynamic routing protocols, including OSPF, RIP, and BGP.
• Configure and apply standard ACLs to enforce security and traffic policies.
• Configure, maintain, and troubleshoot Cisco/Juniper enterprise switching environments (Catalyst, Nexus, EX, QFX).
• Design and implement VLANs, trunking (802.1Q), and inter-VLAN routing to support multi-tenant environments.
• Manage STP/RSTP/MST for loop-free topology and rapid convergence.
• Deploy EtherChannel/LACP for link redundancy and throughput optimization.
• Administer, configure, and manage Cisco ASA appliances, including VPN solutions and secure remote access.
• Implement and manage firewall platforms (Cisco ASA/Firepower, Palo Alto, Juniper SRX) with security hardening.
• Enforce DoD/DISA STIGs and security baselines across network infrastructure.
• Monitor, optimize, and troubleshoot network performance for high availability, reliability, and security.

Skills

Network Infrastructures

Networking Hardware

Network Systems

Job description

Job Qualifications: Network Infrastructures, Networking Hardware, Network Systems

Job Description

Transform technology into opportunity a Network Computer Systems Administrator with GDIT. A career in enterprise IT means connecting and enhancing the systems that matter most. At GDIT you’ll be at the forefront of innovation and play a meaningful part in improving how agencies operate. At GDIT, people are our differentiator. As a Network Computer Systems Administrator, you will help ensure today is safe and tomorrow is smarter.

HOW A PROJECT MANAGER WILL MAKE AN IMPACT

• Install, configure, and maintain enterprise LAN/WAN infrastructure, including routers, switches, firewalls, and VPNs.
• Independently design and build new network environments, including topology, configuration, and architecture planning.
• Configure and troubleshoot dynamic routing protocols, including OSPF, RIP, and BGP.
• Configure and apply standard ACLs to enforce security and traffic policies.
• Configure, maintain, and troubleshoot Cisco/Juniper enterprise switching environments (Catalyst, Nexus, EX, QFX).
• Design and implement VLANs, trunking (802.1Q), and inter-VLAN routing to support multi-tenant and segmented environments.
• Manage Spanning Tree Protocol (STP, RSTP, MST) to ensure loop-free topology and rapid convergence.
• Deploy EtherChannel/LACP for link redundancy and throughput optimization.
• Administer, configure, and manage Cisco ASA appliances, including VPN solutions and secure remote access.
• Implement and manage firewall platforms (Cisco ASA/Firepower, Palo Alto, Juniper SRX) with strong experience in rule creation, policy management, and security hardening.
• Enforce DoD/DISA STIGs and security baselines across network infrastructure.
• Monitor, optimize, and troubleshoot network performance to ensure high availability, reliability, and security.
• Provide advanced troubleshooting and root cause analysis for complex connectivity issues.
• Support network modeling, analysis, and capacity planning to align with modernization initiatives.
• Collaborate with engineering teams on integration of emerging technologies and network upgrades.
• Provide mentorship or guidance to user support and network support staff as required.

WHAT YOU’LL NEED TO SUCCEED

• Required Education and Experience: Technical Training, Certification(s) or Degree + 8 years
• Certifications: DoD Manual 8570.01-M at the Information Assurance Technical (lAT) Level II role& Cisco Certified Network Associate (CCNA) minimum requirement; Cisco Certified Network Professional (CCNP) preferred.
• Security Clearance Level: Active TS/SCI with Polygraph
• Location: 100% On‑Site required
• Strong knowledge of OSPF, RIP, and BGP routing protocols (Layer 3)
• Knowledge of standard ACLs for security and traffic filtering
• Strong knowledge of Cisco routing and switching technologies
• Configure, maintain, and troubleshoot enterprise Layer 2 switching (Catalyst, Nexus, EX, QFX)
• VLAN design, trunking (802.1Q), inter‑VLAN routing, and STP/RSTP/MST management
• Experience with EtherChannel/LACP for redundancy and performance
• Ability to configure and manage Cisco ASA appliances
• Knowledge of VPN technologies, secure remote access, and remote administration
• Knowledge of network architecture planning and design
• Familiarity with DoD/DISA STIGs and security baseline enforcement
• Ability to work independently and drive tasks to completion with minimal supervision

GDIT IS YOUR PLACE

• Growth: AI‑powered career tool that identifies career steps and learning opportunities
• Support: An internal mobility team focused on helping you achieve your career goals
• Rewards: Comprehensive benefits and wellness packages, 401K with company match, and competitive pay and paid time off
• Community: Award‑winning culture of innovation and a military‑friendly workplace

#GDITCareers
#WeAreGDIT
#JET

OWN YOUR OPPORTUNITY

Explore an enterprise IT career at GDIT and you’ll find endless opportunities to grow alongside colleagues who share your desire to drive operations forward.

The likely salary range for this position is $124,093 - $161,000. This is not, however, a guarantee of compensation or salary. Rather, salary will be set based on experience, geographic location and possibly contractual requirements and could fall outside of this range.

Scheduled Weekly Hours: 40

Travel Required: None

Telecommuting Options: Onsite

Work Location: USA DC Washington

Total Rewards At GDIT: Our benefits package for all US‑based employees includes a variety of medical plan options, some with Health Savings Accounts, dental plan options, a vision plan, and a 401(k) plan offering the ability to contribute both pre and post‑tax dollars up to the IRS annual limits and receive a company match. To encourage work/life balance, GDIT offers employees full flex work weeks where possible and a variety of paid time off plans, including vacation, sick and personal time, holidays, paid parental, military, bereavement and jury duty leave. To ensure our employees are able to protect their income, other offerings such as short and long‑term disability benefits, life, accidental death and dismemberment, personal accident, critical illness and business travel and accident insurance are provided or available. We regularly review our Total Rewards package to ensure our offerings are competitive and reflect what our employees have told us they value most.

Our Identity Verification Process: As part of the hiring process, we will ask you to complete an identity verification process that leverages advanced biometrics and artificial intelligence to ensure authenticity and protect against identity fraud. You are expected to be on camera during virtual interviews. We reserve the right to take your picture to verify your identity and prevent fraud. By proceeding, you authorize the collection, processing, and use of your biometric data for identity verification and security purposes.

About Our Work: We are GDIT. A global technology and professional services company that delivers technology solutions and mission services to every major agency across the U.S. government, defense and intelligence community. Our 26,000 experts extract the power of technology to create immediate value and deliver solutions at the edge of innovation. We operate across 50+ countries worldwide, offering leading mission‑ready capabilities in AI, cloud, cyber and software development.

Join our Talent Community to stay up to date on our career opportunities and events at gdit.com/tc.

Equal Opportunity Employer / Individuals with Disabilities / Protected Veterans