Network Engineer Sr Principal (TS/SCI with Poly Required)

GCI, Inc.; Virginia, Northern (IL, KY); Hybrid; USD 143,000 - 238,000; Full time

Job summary

GCI, Inc. is seeking a Sr Principal Network Engineer (TS/SCI with Poly) to support on-site operations in the United States. The role involves designing and documenting network architecture, configuring routers and switches, and managing core services such as LDAP, DHCP, DNS, and file/license servers.

Candidates should have extensive network engineering experience and a current TS/SCI clearance. The position requires hands-on administration of Windows and Linux systems, patch management, backups,

Qualifications

• US citizen with active TS/SCI clearance with Polygraph.
• 10+ years of related network engineering experience.
• Bachelor of Science or higher in CS or related field.
• Experience configuring network devices and cloud environments.
• Ability to work on-site in US government setting.

Responsibilities

• Design and document network architecture.
• Configure routers and managed switches.
• Install, configure and manage network services including LDAP, DHCP, DNS, File Servers, and License Servers.
• Perform daily oversight.
• Install, configure and manage Windows and Linux based computer systems.
• Install vendor software patches and update software repositories.
• Perform data backups and restorations; provide end user support.
• Create and manage a virtualized computing environment including storage and virtualization software.
• Create and manage cloud instances and patching.
• Manage user accounts and access and perform vulnerability scans.

Skills

10 years experience

Network design

Routers & switches

LDAP DHCP DNS

Windows/Linux admin

Education

Bachelor of Science in Computer Science or related field

Tools

Virtualization

Cloud instances

Job description

Network Engineer Sr Principal (TS/SCI with Poly Required)

Job Category: IT Infrastructure and Operations

Requisition Number: NETWO002269

• Posted : August 19, 2026
• Full-Time
• On-site
• Salary Range : $142,792 USD to $238,451.20 USD

GCI embodies excellence, integrity and professionalism. The employees supporting our customers deliver unique, high-value mission solutions while effectively leverage the technological expertise of our valued workforce to meet critical mission requirements in the areas of Data Analytics and Software Development, Engineering, Targeting and Analysis, Operations, Training, and Cyber Operations. We maximize opportunities for success by building and maintaining trusted and reliable partnerships with our customers and industry.

Program is looking for a Network Engineer to work on an exciting team to maintain and review our existing system and help architect a new system enable customer mission. As a Network Engineer, a typical day will include:

Responsible for managing compute networks and network services:

• Design and document network architecture.
• Configure routers and managed switches.
• Install, configure and manage network services including LDAP, DHCP, DNS, File Servers, and License Servers.
• Perform daily oversight.

Responsible for computer systems administration:

• Perform installation, configuration, and management of Windows and Linux based computer systems.
• Install vendor software patches.
• Updated software repositories.
• Perform data backups and restorations.
• Provide end user support.
• Perform daily oversight.

Experience in configuration and administration of a virtualize and storage environment:

• Demonstrated ability to create a virtualized computing environment including the installation and configuration of hardware.
• Installation and configuration of Linux OS.
• Installation and configuration of a Virtualized Environment.
• Installation and configuration of a Storage Environment.
• Install vendor upgrade and patching.
• Install and run system scanning tools.

Experience with creating and managing instances in a cloud environment.

• Familiarity with cloud architecture.
• Familiarity with the creation and configuration of cloud instances.
• Familiarity with patching and upgrade of cloud instances.

Experience with network and system security:

• Manage user accounts and accesses.
• Perform vulnerability scans and report results.

A candidate must be a US Citizen and requires an active/current TS/SCI with Polygraph clearance.

Equal Opportunity Employer / Individuals with Disabilities / Protected Veterans

Qualifications

Skills

Behaviors

Motivations

:

Education

Preferred

Bachelor of Science or better in Computer Science or related field.

Experience

Required

10 years:

Demonstrated work related experience.

Licenses & Certifications

Equal Opportunity Employer
This employer is required to notify all applicants of their rights pursuant to federal employment laws.For further information, please review the Know Your Rights notice from the Department of Labor.