Senior Systems Administrator

RGNext

Systems Administrator III at RGNext supporting missile testing operations at Reagan Test Site Operations Center. Focused on Windows administration in a secure IT environment.

Posted 4/28/2026full-timeHuntsville • Alabama • 🇺🇸 United StatesMid-LevelSeniorWebsite

Tech Stack

Tools & technologies

Cyber SecurityLinux

About the role

Key responsibilities & impact

Support the Reagan Test Site (RTS) Operations Center - Huntsville as a Systems Administrator III
Work with a team supporting mission initiatives in a secure, isolated computing environment with a primary focus on Windows administration
Work with peers, internal customers, and management to create a highly available, resilient, and standardized IT infrastructure
Install, maintain, and support multiple Windows-based servers on physical and virtual platforms in support of RTS initiatives
Troubleshoot issues that arise as well as look for issues proactively
Maintain a secure computing environment, including adherence to a backup schedule, patching of all systems, and applying applicable STIG settings
Maintain a regular and predictable work schedule
Establish and maintain effective working relationships within the department, and within the wider RGNext business units
Maintain hardware lifecycle by deploying replacement systems in a timely fashion
Perform root cause analysis and resolution for hardware and software issues
Install and update software packages from repositories or local file systems
Manage local users and groups and with Active Directory integration
Secure physical and virtual machines to DISA STIG requirements
Provide mission support as needed
Perform other related duties as assigned

Requirements

What you’ll need

Bachelor’s degree in computer science, Information Systems, or related field or experience in lieu of education
Five (5) or more years’ experience working in related field in Information Technology
Must have and maintain or be able to obtain prior to start date a Security+, CySA+, GICSP, or similar certification meeting DoD 8140.01 / DoD 8570.01 baseline certification for IAT Level II
Must have and maintain or be able to obtain within three months of start date a CE (Computer Environment), Linux+, Server+, or similar certification meeting DoD 8140.01/ DoD 8570.01 baseline certification for IAT Level II
The ability to obtain and maintain a U.S. government issued Secret security clearance is required
U.S. citizenship is required, as only U.S. citizens are eligible for a security clearance
Must apply extensive knowledge of a variety of Cyber Security field concepts, practices, and procedures to ensure the secure integration and operation of enclave systems
Knowledge of and advanced troubleshooting skills with Windows Server 2022, Windows 11, and newer
Strong documentation skills, organizational skills, and the ability to interact with team members cross-functionally
Strong verbal and written communication skills
Strong organization and project management skills
Ability to deploy, configure, and maintain Windows systems within a DoD environment
Basic network troubleshooting skills
The flexibility to work occasional non-duty hours on weekends to support specific project of requirements

Benefits

Comp & perks

Employees enjoy a robust benefit package on day one, which includes medical, dental, vision, disability and life insurances
Generous Paid Time Off and holiday pay
A retirement savings plan with a company match and vesting on day one!

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

Windows administrationWindows Server 2022Windows 11Active Directoryroot cause analysishardware lifecycle managementsoftware installationnetwork troubleshootingCyber Security conceptsSTIG compliance

Soft Skills

documentation skillsorganizational skillscommunication skillsproject management skillsinterpersonal skillsteam collaborationproblem-solving skillsflexibilityproactive issue resolutionrelationship building

Certifications

Security+CySA+GICSPCE (Computer Environment)Linux+Server+