Linux/MacOS Systems Administrator (5766)

SMX is seeking a motivated and detail-oriented Linux/macOS Systems Administrator to support enterprise IT infrastructure onsite at NAS Patuxent River, MD. This position is responsible for administering, maintaining, and securing Linux and macOS systems across classified and unclassified environments.

The ideal candidate will have experience with Linux system administration, macOS endpoint management, and cybersecurity compliance. This role will leverage VMware Workspace ONE Unified Endpoint Management (UEM) to manage and secure endpoints while supporting daily operations, troubleshooting, and system maintenance.

We are looking for a self-starter who is comfortable working independently, learning new technologies, and collaborating with technical teams to support mission requirements.

Essential Duties & Responsibilities

• Install, configure, administer, maintain, and troubleshoot Linux and macOS operating systems across enterprise IT environments.
• Manage and secure Linux and macOS endpoints using VMware Workspace ONE Unified Endpoint Management (UEM).
• Develop, deploy, and maintain endpoint configurations, security policies, compliance profiles, and software packages.
• Implement and maintain DISA Security Technical Implementation Guides (STIGs) to support compliance with DoD cybersecurity requirements.
• Perform vulnerability assessments, analyze findings, and coordinate remediation activities using ACAS and other approved security tools.
• Monitor system performance, availability, and security to identify and resolve operational issues.
• Perform operating system updates, security patching, software installations, and routine system maintenance.
• Troubleshoot hardware, software, operating system, and network connectivity issues affecting Linux and macOS environments.
• Support the administration and maintenance of systems operating within classified and unclassified environments.
• Collaborate with cybersecurity, engineering, and infrastructure teams to resolve technical issues and implement system improvements.
• Maintain accurate system documentation, configuration records, standard operating procedures, and troubleshooting guides.
• Identify opportunities to improve system reliability, security, automation, and operational efficiency.
• Provide technical support to customers and stakeholders, ensuring timely resolution of incidents and service requests.
• Perform additional duties as assigned to support operational and mission requirements.

Required Skills & Experience

• Clearance Required: Top Secret
• Minimum of 3 years of professional experience in systems administration, IT infrastructure support, or a related technical field.
• Active CompTIA Security+ certification or equivalent DoD 8570 IAT Level II certification.
• Experience administering, configuring, and troubleshooting Linux operating systems, including RHEL, Ubuntu, or CentOS.
• Working knowledge of macOS administration, configuration, and troubleshooting.
• Experience with enterprise endpoint management, software deployment, and system maintenance.
• Understanding of DoD cybersecurity requirements, system hardening, and security compliance practices.
• Familiarity with DISA STIG implementation, vulnerability management, and remediation processes.
• Knowledge of networking fundamentals, operating system security, and troubleshooting methodologies.
• Strong technical troubleshooting, problem-solving, documentation, and communication skills.
• Ability to work independently, prioritize competing requirements, and collaborate effectively with technical teams.
• Ability to work onsite at NAS Patuxent River, MD, and support classified and unclassified computing environments.

Desired Skills & Experience

• Bachelor's degree in Information Technology, Computer Science, Cybersecurity, or a related technical field.
• Experience with scripting and automation using Bash, Python, PowerShell, or similar technologies.
• Familiarity with virtualization technologies, including VMware vSphere.
• Knowledge of enterprise identity and access management, including Active Directory, LDAP, and certificate-based authentication.
• Previous experience supporting DoD or federal government IT environments.
• Additional industry certifications, such as Red Hat Certified System Administrator (RHCSA), CompTIA Linux+, or relevant Apple administration certifications.

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The SMX salary determination process takes into account a number of factors, including but not limited to, geographic location, Federal Government contract labor categories, relevant prior work experience, specific skills, education and certifications. At SMX, one of our Core Values is to Invest in Our People so we offer a competitive mix of compensation, learning & development opportunities, and benefits. Some key components of our robust benefits include health insurance, paid leave, and retirement.