Senior Network Administrator - TS/SCI with Polygraph

General Dynamics Information Technology•Washington, DC

2d•$124,093 - $161,000•Onsite

About The Position

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.

Requirements

Technical Training, Certification(s) or Degree + 8 years of related experience
DoD Manual 8570.01-M at the Information Assurance Technical (lAT) Level II role & Cisco Certified Network Associate (CCNA) minimum requirement
Active TS/SCI with Polygraph security clearance
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
US Citizenship Required

Nice To Haves

Cisco Certified Network Professional (CCNP) preferred

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 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.

Benefits

Comprehensive benefits and wellness packages
401K with company match
Competitive pay
Paid time off
Variety of medical plan options
Health Savings Accounts
Dental plan options
Vision plan
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
Full flex work weeks where possible
Variety of paid time off plans, including vacation, sick and personal time, holidays, paid parental, military, bereavement and jury duty leave
Short and long-term disability benefits
Life, accidental death and dismemberment, personal accident, critical illness and business travel and accident insurance