Mirrai Careers

Systems Administrator (Linux & Windows)

Agile Defense

Fort Huachuca, AZ Posted 3d ago
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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 #: 1894 Job Title: Systems Administrator (Linux & Windows) Location: On-Site, Fort Huachuca, AZ Clearance Level: Secret, Must Have Clearance to Start JOB SUMMARY Seeking a versatile and mission-driven Systems Administrator (Linux & Windows) with dedicated experience as a Microsoft Endpoint Configuration Manager (MECM / SCCM) administrator. In this role, you will maintain, configure, and secure a heterogeneous enterprise hosting and laboratory testing environment comprising Red Hat Enterprise Linux (RHEL), modern Microsoft Windows Server (2019/2022), and Windows 10/11 endpoints. You will be responsible for end-to-end endpoint life cycle management, centralized patch orchestration, operating system deployments, system hardening, and continuous cyber-compliance. Working closely with cybersecurity leads and infrastructure engineers, you will ensure high system availability, rapid vulnerability remediation, and rigorous adherence to defense cybersecurity frameworks. JOB RESPONSIBILITIES Endpoint Lifecycle Management & MECM/SCCM Administration Serve as the primary administrator for Microsoft Endpoint Configuration Manager (MECM / SCCM), managing infrastructure health, site systems, distribution points, and client agent health across all connected enclaves. Engineer, test, deploy, and maintain standardized Windows Operating System Deployment (OSD) task sequences and baseline golden images. Package, test, distribute, and automate application installations, scripts, and software updates across heterogeneous lab and hosting workstations and servers. Manage and orchestrate enterprise-wide software update distribution using Software Update Points (SUP) integrated with Windows Server Update Services (WSUS). Create and deploy custom compliance baselines and configuration items (CIs) to enforce security settings, STIG configurations, registry keys, and audit controls. Develop custom MECM queries, device collections, and reports (SSRS) to provide real-time hardware/software inventory, asset discovery, and compliance auditing. Systems Administration (Linux & Windows) Administer, build, configure, and maintain physical and virtual Red Hat Enterprise Linux (RHEL) servers, modern Windows Servers (2019/2022), and Windows 10/11 workstations. Manage core directory and identity infrastructure, including Active Directory Domain Services (AD DS), Group Policy Objects (GPOs), DNS, DHCP, and role-based access control. Troubleshoot and maintain enterprise Linux services, including SE Linux policies/security contexts, daemon services (systemd, chronyd), file systems (/opt, logical volumes), and local package managers. Maintain hypervisor and storage infrastructure, including Nutanix, VMware ESXi/vCenter, and enterprise backup/restore solutions (e.g., Cohesity, snapshots). Support basic multi-tier database hosting and connectivity for Oracle and Microsoft SQL server backends. Process, approve, and maintain user access documentation and account provisioning via DD Form 2875 and identity management systems. Issue, configure, and troubleshoot Public Key Infrastructure (PKI) certificates, CAC authentication, and secure remote protocols across all client and server endpoints. Cybersecurity, Vulnerability Management & Compliance Maintain strict system security posture in compliance with Defense Information Systems Agency (DISA) Security Technical Implementation Guides (STIGs) and Security Requirements Guides (SRGs). Execute, review, and analyze weekly Assured Compliance Assessment Solution (ACAS / Tenable Nessus) vulnerability scans and monthly STIG evaluations. Rapidly remediate identified CVEs, IAVM alerts, CTO/DTO directives, and vendor patches across both Windows and Linux fleets. Draft, track, and update Plans of Action and Milestones (POA&Ms) for items requiring architectural mitigations or extended test schedules. Maintain endpoint security agents across all hosts, including Trellix/ePO agents, endpoint detection and response (EDR), and application whitelisting tools (e.g., fapolicyd). Monitor and analyze system, security, and application logs using SIEM and centralized log management tools (e.g., LogRhythm, Elastic Fleet). QUALIFICATIONS & EDUCATION Required Certifications Active DoD 8570/8140 IAT Level II Baseline Certification (e.g., CompTIA Security+ CE, CCNA Security, CySA+, GICSP, GSEC, or SSCP). Relevant computing environment (CE) / vendor training or certification in Microsoft Windows Server/MECM or Red Hat Enterprise Linux (or ability to complete within 6 months of hire). Education Education: Bachelor’s degree in Computer Science, Information Technology, Cybersecurity, or related STEM discipline (equivalent relevant professional experience may be substituted in lieu of degree). Years of Experience: Minimum of 3–5+ years of hands-on systems administration experience across mixed Linux (RHEL) and Windows enterprise server/workstation environments. Minimum of 2+ years of dedicated, hands-on administration of Microsoft Endpoint Configuration Manager (MECM / SCCM) in an enterprise or lab environment. ADDITIONAL & PREFERRED SKILLS Demonstrable proficiency configuring, operating, and troubleshooting MECM/SCCM (OSD, application packaging, software update deployments, collection management). Strong working knowledge of Linux administration, specifically Red Hat Enterprise Linux (RHEL), CLI troubleshooting, package management, daemon tuning, and SELinux enforcement. Solid experience with Windows Server (2019/2022) administration, Active Directory, GPO authoring/troubleshooting, and DNS. Experience with DoD vulnerability and compliance tooling: ACAS (Tenable/Nessus), SCAP Compliance Checker (SCC), and STIG Viewer (.ckl generation). Understanding of enterprise backup technologies, bare-metal server recovery, and hypervisor virtualization (Nutanix AHV, VMware). Excellent written communication skills for authoring Standard Operating Procedures (SOPs), weekly status reports, and technical troubleshooting documentation. Preferred Skills Prior experience administering systems within DoD enterprise testing facilities, operational lab environments, or defense staging enclaves. Proficiency with PowerShell scripting and Linux Shell (Bash) scripting to automate routine administration, reporting, and deployment tasks. Hands-on experience managing and troubleshooting enterprise backup appliances (e.g., Cohesity) and application whitelisting tools (e.g., fapolicyd). Familiarity with Elastic Agent/Fleet management, LogRhythm, or enterprise SIEM architectures. Basic understanding of perimeter network components (firewalls, VPNs, F5 BIG-IP load balancers) and cloud hosting environments (AWS GovCloud). WORKING ENVIRONMENT Work is primarily performed within environmentally controlled indoor office and laboratory (enterprise server room / lab floor). Occasional exposure to server room noise, cool temperatures, and standard data center environmental controls. High-tempo technical environment requiring frequent interaction with multi-disciplinary engineering, testing, and cybersecurity teams.   Strength Demands Light to Medium Work: Must be able to exert up to 30–50 pounds of force occasionally, and/or up to 20 pounds of force frequently to lift, carry, push, pull, or otherwise move rack-mounted hardware, server components, workstations, peripherals, and network cabling. Physical Requirements Sitting or standing at computer workstations for extended periods. Dexterity of hands and fingers to operate computer keyboards, mice, test equipment, and hand tools (e.g., rack installation tools, screwdrivers). Stooping, kneeling, crouching, reaching, and bending required when installing or cabling servers, switches, or workstations in server racks and lab benches. Visual acuity to read fine print, computer monitors, wiring labels, and console screens for extended periods. 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 into 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 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

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