Network Administrator Senior

About this role

Type of Requisition: Regular

Clearance Level Must Currently Possess: Top Secret/SCI

Clearance Level Must Be Able to Obtain: Top Secret/SCI

Public Trust/Other Required: None

Job Family: IT Infrastructure and Operations

Job Qualifications: Skills: Network Configurations, Networking Hardware, Network Operations Certifications: None Experience: 3 + years of related experience US Citizenship Required: Yes

Job Description: 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.

How a Network Administrator will Make an Impact: • 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.

What You’ll Need to Succeed

Required Experience: • 3+ years of experience

Required Technical Skills: • 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

Required Certifications: • CompTIA Security+

• Cisco Certified Network Associate (CCNA)

Security Clearance Level: • TS/SCI

Required Skills and Abilities: • 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

Preferred Skills: • 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)

Location: • On Customer Site

Citizenship Required: • US Citizenship

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The likely salary range for this position is $106,250 - $143,750. 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: Less than 10%

T elecommuting Options: Onsite

Work Location: USA VA Newington

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.    

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 acro

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