Network Administrator Senior

About the role

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.

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.

Requirements

• 3+ years of experience
• US Citizenship required
• Top Secret/SCI clearance currently held and ability to obtain TS/SCI

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)

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)

Pay

The likely salary range for this position is $106,250 – $143,750. Salary will be set based on experience, geographic location and possibly contractual requirements and could fall outside of this range.

Schedule

• Scheduled Weekly Hours: 40
• Travel Required: Less than 10%
• Telecommuting Options: Onsite
• Work Location: USA VA Newington
• Additional Work Locations: USA