System Administrator, Sr Principal

Public Trust: None

Requisition Type: Regular

Your Impact

Own your opportunity to support our nation's defense. Make an impact by connecting and securing critical operations across the globe, keeping our country safe and secure.

Job Description

A Sr Principal Systems Administrator is a senior-level IT professional responsible for leading the design, implementation, and ongoing management of the Defense Threat Reduction Agency’s (DTRAs) core systems, infrastructure, and security frameworks. This position requires deep technical expertise, leadership influence, and the ability to drive operational excellence across complex environments.

The Sr. Principal Systems Administrator plays a critical role in managing and optimizing this environment. This senior-level position involves leading system administration efforts, maintaining system performance, and ensuring the security and integrity of data across various platforms. The ideal candidate brings extensive technical expertise and leadership experience to drive projects that enhance efficiency and effectiveness. This job description outlines the key responsibilities, required qualifications, and expectations associated with the role of a Sr. Principal Systems Administrator.

WHAT YOU’LL NEED TO SUCCEED

The ideal candidate will possess deep expertise in Windows environments, infrastructure automation, database management, and data analysis to drive operational efficiency.

• Deep hands-on experience with Active Directory administration, certificate lifecycle management, and enterprise authentication protocols.

• Strong experience administering, configuring, and managing Virtual Machines in VMware or Microsoft Hyper-V hypervisors.

• Solid proficiency in SQL database management, including writing queries and performing general database administration. Experience managing and maintaining File Server Resource Manager (FSRM) and enterprise file systems.

• Demonstrated ability to extract and synthesize data from Active Directory, SQL, and Microsoft Configuration Manager (MCM) databases, SQL, and general CSV manipulation for system forensics and data analysis.

• Remotely manage distributed servers, switches, and workstations within each local site by a central location where possible.

• Plan, coordinate, and implement network security measures through manual configuration, installation of patches, or the application of scripts to protect data, software, and hardware.

• Mitigate vulnerability security findings on workstations and servers and coordinate the resolution between security and local on-site teams.

• Troubleshoot server and workstation failures related to software deployments, and Windows operating system updates.

• Maintain all servers within the configuration baselines and all STIGs and accurately configure and apply patches to all systems.

• Participate in technical exchanges as required.

• Provide technical and operational input to Change Review activities.

• Review existing documentation for the server, services, and maintenance processes and procedures, and provide recommendations for improvements/changes.

• Assist network and systems security personnel in IA incident response.

Bring your technology expertise and drive for innovation to GDIT.

• Education : Bachelor’s degree in computer science, Information Technology, or a related field.
• Experience : Minimum 8 years of systems administration experience
• Technical skills :

  • Expertise in Windows/Linux server management, virtualization, and cloud platforms (e.g., Microsoft Azure, AWS)

  • Proficiency in scripting (PowerShell, Bash), automation tools, and infrastructure-as-code (IaC) practices.

  • Security clearance level: TS

  • US citizenship required

GDIT IS YOUR PLACE
At GDIT, the mission is our purpose, and our people are at the center of everything we do.
● Growth: AI-powered career tool that identifies career steps and learning opportunities
● Support: An internal mobility team focused on helping you achieve your career goals
● Rewards: Comprehensive benefits and wellness packages, 401K with company match, and competitive pay and paid time off
● Community: Award-winning culture of innovation and a military-friendly workplace

OWN YOUR OPPORTUNITY
Explore an enterprise IT career at GDIT and you’ll find endless opportunities to grow alongside colleagues who share your desire to drive operations forward.

#gditpriority

#armajobs

Work Requirements

Years of Experience

8 + years of related experience

* may vary based on technical training, certification(s), or degree

Certification

Travel Required

Less than 10%

Citizenship

U.S. Citizenship Required