System Administrator (Intermediate)

Agile Defense, Inc.; Huntsville (TN); On-site; USD 70,000 - 110,000; Full time

Job summary

Agile Defense, Inc. is seeking an Intermediate Systems Administrator for an on-site role in Huntsville, AL. You will provision, secure, and maintain multi-platform systems in a DoD environment, ensuring RMF/NIST 800-53 compliance and supporting cybersecurity teams.

The role emphasizes automation, vulnerability management, and incident resolution across Windows and Linux estates, with 24x7 readiness and on-call rotation as needed.

Qualifications

• Bachelor's degree in a STEM field or equivalent experience.
• Minimum 5 years of relevant systems administration experience.
• Security compliance experience with RMF/NIST SP 800-53 is preferred.

Responsibilities

• Administer and maintain Windows and Linux servers and workstations.
• Manage AD, DNS, DHCP, and GPOs; support virtualization and storage infra.
• Run vulnerability remediation and apply STIGs for RMF compliance.
• Develop automation scripts with PowerShell / Bash / Ansible.
• Collaborate with Cybersecurity and Software Engineering teams; support RMF docs.

Skills

VMware ESXi / vCenter

Windows Server admin

Active Directory / GPOs

Linux (RHEL / Ubuntu)

Vulnerability scanning (ACAS/Nessus)

Patch management (WSUS / Tanium / Ans

PowerShell / Bash scripting

Education

Bachelor’s Degree in Computer Science / IT / Cybersecurity or related STEM

Tools

VMware ESXi

Active Directory

DNS / DHCP

Ansible

Job description

About Agile Defense

At Agile Defense we know that action defines the outcome and new challenges require new solutions. That’s why we always look to the future and embrace change with an unmovable spirit and the courage to build for what comes next.

Our vision is to bring adaptive innovation to support our nation’s most important missions through the seamless integration of advanced technologies, elite minds, and unparalleled agility—leveraging a foundation of speed, flexibility, and ingenuity to strengthen and protect our nation’s vital interests.

Requisition #: 1800

Job Title: System Administrator (Intermediate)

Location: On-Site, Huntsville, AL

Clearance Level: Secret, Must Have Clearance to Start

Required Certification(s): IAT Level II Baseline

Job Description
The Intermediate Systems Administrator provides critical systems engineering, administration, and cybersecurity support for a multi-platform computing environment supporting a Department of Defense (DoD) government contract. The successful candidate will join a cohesive technical team responsible for the effective provisioning, installation, configuration, maintenance, and secure operations of physical and virtual system hardware, operating systems (Windows and/or Linux), and associated infrastructure enclaves.

This role demands a balance of robust technical skills, adherence to strict federal security compliance guidelines, and the ability to solve moderately complex technical issues independently while collaborating with Cybersecurity and Software Engineering teams.

Duties and Responsibilities

• Systems Administration & Maintenance (45%)
• Installation and Provisioning: Install, configure, and maintain physical and virtual servers (Windows Server 2019/2022, Red Hat Enterprise Linux, Ubuntu) and enterprise workstations. Infrastructure Management: Administer essential network services including Active Directory (AD), Group Policy Objects (GPOs), Domain Name System (DNS), and Dynamic Host Configuration Protocol (DHCP).
• Virtualization Support: Maintain and optimize VMware ESXi environments, vCenter Server, and associated virtual infrastructure to ensure maximum uptime. Backup & Recovery: Implement, test, and maintain robust data backup, disaster recovery, and system replication plans.
• Storage Administration: Assist in managing network-attached storage (NAS) and storage area network (SAN) configurations.
• Cybersecurity Compliance & Hardening (35%)
• Vulnerability Remediation: Regularly review, assess, and patch vulnerabilities identified by automated scanning tools such as ACAS (Assured Compliance Assessment Solution) and Nessus. System Hardening: Apply Defense Information Systems Agency (DISA) Security Technical Implementation Guides (STIGs) to operating systems, browsers, and application enclaves to ensure compliance with Risk Management Framework (RMF) and NIST SP 800-53 standards.
• Audit and Compliance: Collaborate closely with Cybersecurity Professionals to compile and maintain RMF-compliant documentation, system security plans, and configuration management logs. Certificate Management: Implement and troubleshoot Public Key Infrastructure (PKI) and Single Sign-On (SSO) configurations.
• Scripting, Automation & Network Support (10%)
• Automation: Develop and refine administrative scripts using PowerShell, Bash, or Ansible to automate recurring tasks, patching schedules, and security configuration baselines. Network Troubleshooting: Provide configuration and basic troubleshooting support for enterprise switches (e.g., Cisco), firewalls, and secure local area network (LAN) connections.
• User Support & Professional Collaboration (10%)
• Ticketing System: Familiarization and experience with support ticketing system such as ServiceNow to actively management customer requests and system projects. Tier II/III Support: Deliver advanced technical troubleshooting, end-user training, and incident resolution for escalated helpdesk requests. Documentation: Draft and maintain system administrator manuals, standard operating procedures (SOPs), and system architecture diagrams using tools like Microsoft Visio.

Education and Background

• Required Education & Experience Education: Bachelor’s Degree in Computer Science, Information Technology, Cybersecurity, or a related STEM field. Appropriate experience can be accepted in lieu of Degree.
• Experience: A minimum of five (5) years of relevant systems administration experience.

Years of Experience
Minimum 5 years of relevant system administration experience.

Required Skills
Required Technical Competencies

• Proven experience managing virtual environments (VMware ESXi, vSphere, or vCenter).
• Strong working knowledge of Windows Server administration, Active Directory, and GPOs. Hands-on experience administering Linux environments (specifically RHEL or Ubuntu).
• Demonstrated experience with vulnerability scanners (ACAS, Nessus, SCAP Compliance Checker).
• Familiarity with patch management software (WSUS, Tanium, or Ansible).

Preferred Skills

• Preferred (Desired) Qualifications Direct experience supporting the US military and agency programs in Huntsville, AL.
• Experience with containerization technologies such as Red Hat OpenShift, Kubernetes, or Docker.
• Experience with Continuous Integration/Continuous Delivery (CI/CD) environments and tools (Gitlab, Ansible Automation, Jenkins, or Azure DevOps). Active Server certifications: Server+.

Working Conditions
Physical Demands & Work Environment

• On-site Status: 100% on-site in Huntsville, AL
• Work Hours: Standard business hours; however, systems are operational 24x7. Candidates must have the flexibility to participate in an on-call rotation or periodic work outside standard hours to perform system patching/upgrades.
• Physical Requirements: Ability to lift and rack standard IT equipment (up to 35-40 lbs), work under raised floor environments, and navigate typical laboratory and server room spaces.
• Travel: Minimal domestic travel (up to 10%) may be required to support secondary contractor sites or exercise events.

Our Core Values

Employees of Agile Defense are our number one priority, and the importance we place on our culture here is fundamental. Our culture is alive and evolving, but it always stays true to its roots. Here, you are valued as a family member, and we believe that we can accomplish great things together. Agile Defense has been highly successful in the past few years due to our employees and the culture we create together.

What makes us Agile? We call it the 6Hs, the values that define our culture and guide everything we do. Together, these values infuse vibrancy, integrity, and a tireless work ethic to advancing the most important national security and critical civilian missions. It’s how we show up every day. It's who we are.

• Happy - Be Infectious. Happiness multiplies and creates a positive and connected environment where motivation and satisfaction have an outsized effect on everything we do.
• Helpful - Be Supportive. Being helpful is the foundation of teamwork, resulting in a supportive atmosphere where collaboration flourishes, and the collective success is celebrated.
• Honest - Be Trustworthy. Honesty serves as our compass, ensuring transparent communication and ethical conduct, essential to who we are and the complex domains we support.
• Humble - Be Grounded. Success is not achieved alone, humility ensures a culture of mutual respect, encouraging open communication, and a willingness to learn from one another and take on any task.
• Hungry - Be Eager. Our hunger for excellence drives an insatiable appetite for innovation and continuous improvement, propelling us forward in the face of new and unprecedented challenges.
• Hustle - Be Driven. Hustle is reflected in our relentless work ethic, where we are each committed to going above and beyond to advance the mission and achieve success.

Equal Opportunity Employer/Protected Veterans/Individuals with Disabilities