Network Administrator Senior

General Dynamics Information Technology•Newington, VA

21h•$106,250 - $143,750•Onsite

About The Position

Seize your opportunity to make a personal impact as a Network Administrator Senior supporting enterprise network operations for our federal customer. GDIT is your place to make meaningful contributions to challenging projects and grow a rewarding career. At GDIT, people are our differentiator. As a Network Administrator Senior you will help ensure today is safe and tomorrow is smarter. Our work depends on a Network Administrator Senior joining our team to maintain and enhance secure, reliable, and high‑performance network services that enable the customer’s critical mission operations.

Requirements

3+ years of experience
Experience configuring and supporting network switches and routers
Strong understanding of TCP/IP, DNS, DHCP, STP, SNMP, and routing fundamentals
Hands‑on experience with Cisco ISE and DNA Center (DNA‑C)
Knowledge of firewalls, ACLs, NAT, and VPN technologies
Proficiency with VLANs, trunking, inter‑VLAN routing, and segmentation
Experience with packet capture and analysis tools (e.g., Wireshark, NetFlow)
Familiarity with enterprise wireless technologies and basic RF troubleshooting
Understanding of network access control systems (RADIUS, TACACS+, 802.1X)
Working knowledge of cabling standards, fiber infrastructures, and physical network components
CompTIA Security+
Cisco Certified Network Associate (CCNA)
TS/SCI Security Clearance
Strong troubleshooting and analytical skills with a methodical approach to problem solving
Effective verbal and written communication skills to collaborate with technical and non‑technical stakeholders
Ability to follow standard operating procedures, change management processes, and security/compliance requirements
Strong attention to detail and ability to maintain accurate documentation
Ability to work both independently and as part of a team in a fast‑paced, mission‑focused environment
US Citizenship Required

Nice To Haves

Experience with cloud networking concepts (Azure or AWS)
Exposure to SD‑WAN technologies
Familiarity with VoIP and QoS principles
Experience with network automation tools or scripting (e.g., Python, PowerShell, Ansible)

Responsibilities

Work closely with senior network engineers, system administrators, and security teams to troubleshoot issues, resolve incidents, and implement network changes in a collaborative team environment.
Participate in network design discussions and deployments, supporting equipment setup, cabling, fiber work, and physical infrastructure buildouts while adhering to established standards and best practices.
Support Cisco ISE and DNA Center (DNA‑C) to manage network access control, policy‑based automation, and assurance in a fast paced environment.
Implement and manage VLANs, routing policies, access control rules, and network segmentation to support secure, scalable, and logically separated environments.
Assist in maintaining secure network environments by enforcing firewall rules, VPN configurations, network access control policies, and security best practices in support of compliance and cyber defense objectives.
Utilize full scope of technical and interpersonal skills to further the mission.

Benefits

Variety of medical plan options, some with 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 leave
Paid military leave
Paid bereavement leave
Paid jury duty leave
Short and long-term disability benefits
Life insurance
Accidental death and dismemberment insurance
Personal accident insurance
Critical illness insurance
Business travel and accident insurance