Senior Network Administrator - TS/SCI with Polygraph

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

Benefits offered by this job

401K with company match

Paid time off

Career development opportunities

Job summary

General Dynamics Information Technology, Inc. seeks a Network Administrator in Washington, DC, on-site. This role demands TS/SCI with Polygraph and DoD 8570.01-M IAT II, CCNA at minimum; CCNP preferred. You will install and secure enterprise LAN/WAN, design networks, and mentor staff.

The position offers a challenging mission-focused IT environment with cutting-edge technologies and robust benefits.

Qualifications

• Technical Training, Certification(s) or Degree + 8 years.
• DoD 8570.01-M at the Information Assurance Tech (IAT) Level II and CCNA minimum; CCNP preferred.
• Active TS/SCI with Polygraph clearance.
• Location: 100% On-Site in Washington, DC.

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 OSPF, RIP, and BGP routing protocols.
• Configure, maintain, and troubleshoot Cisco/Juniper enterprise switching (Catalyst, Nexus, EX, QFX).
• Design VLANs, trunking (802.1Q), inter-VLAN routing for multi-tenant environments.
• Manage STP/RSTP/MST and EtherChannel/LACP for redundancy and throughput.
• Administer Cisco ASA appliances, VPNs, and secure remote access.
• Enforce DoW/DISA STIGs and security baselines across infrastructure.
• Provide performance monitoring, root-cause analysis, and capacity planning.

Skills

Network infrastructures

Networking hardware

Network systems

Tools

Cisco

Juniper

Palo Alto

Job description

Type of Requisition

Regular Clearance Level Must Currently Possess: Top Secret SCI + Polygraph Clearance Level Must Be Able to Obtain: Top Secret SCI + Polygraph Public Trust/Other Required: None Job Family: IT Infrastructure and Operations

Job Qualifications

Skills: Network Infrastructures, Networking Hardware, Network Systems Certifications: None Experience: 6 + years of related experience US Citizenship Required: Yes

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 Network Administrator 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 DoW/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 DoW/DISA STIGs and security baseline enforcement. Ability to work independently and drive tasks to completion with minimal supervision.

GDIT IS YOUR PLACE

At GDIT, the mission is our purpose, and our people are at the center of everything we do.

• 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

Explore an enterprise IT career at GDIT

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.

Salary Range

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.

Work Hours and Travel

Scheduled Weekly Hours: 40 Travel Required: None Telecommuting Options: Onsite Work Location: USA DC Washington Additional Work Locations:

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.

Identity Verification Process

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

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.

Equality and Diversity

Equal Opportunity Employer / Individuals with Disabilities / Protected Veterans Opportunity Owned From working with technologies like AI, cyber and cloud to careers in intelligence and health, we offer endless opportunities to apply your expertise to create a safer, smarter world.