System Administrator III - Windows​/macOS

Job Details

• Job Category 2E
• Employee Type Exempt FT

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The Systems Administrator - Windows/macOS is responsible for administering, securing, and optimizing both enterprise Windows Server and macOS environments across physical, virtual, and cloud-connected infrastructures in a remote and on‑site work environment. This dual‑platform role manages core Microsoft technologies (Active Directory, Group Policy, DNS, DHCP, Microsoft Entra ) alongside macOS device administration, identity integration, and mobile device management (MDM) platforms.

Success in this role is demonstrated by maintaining secure and highly available systems across both operating systems, effectively resolving complex technical issues, implementing automation and security improvements, ensuring compliance with federal requirements, and supporting mission objectives through collaboration.

• Administer, configure, maintain, and optimize enterprise Windows Server and macOS environments across physical, virtual, and cloud-connected systems. Manage identity and infrastructure services including Active Directory, Group Policy, DNS, DHCP, Microsoft Entra , and MDM platforms (Jamf Pro, Big Fix, MECM, Manage Engine, Intune).
• Develop and maintain OS standards, security configurations, device management policies, and enterprise architecture for Windows and Apple systems.
• Implement federal security requirements (RMF, DISA STIGs), including patching, access controls, vulnerability remediation, and DoD CAC authentication.
• Support endpoint lifecycle management and cloud/virtual environments, including device deployment and administration across VMware, Hyper‑V, Azure, and AWS.
• Monitor system performance and troubleshoot complex cross‑platform issues involving hardware, OS, applications, networking, and user configurations.
• Develop and maintain automation and Infrastructure as Code using Power Shell, Python, Bash, Apple Script, Terraform, and Ansible.
• Conduct vulnerability assessments, analyze findings, and coordinate remediation to support compliance audits and continuous monitoring.
• Collaborate with cybersecurity, network, infrastructure, and end‑user teams to ensure secure, integrated operations and resolve cross‑functional issues.
• Prepare technical documentation including architecture diagrams, procedures, scripts, and troubleshooting guides; provide status updates to the Federal IT Lead and stakeholders.

• Bachelor’s degree in Computer Science, Information Technology, or related field (or equivalent experience).
• 8+ years of systems administration experience, including extensive Windows Server administration and 5+ years supporting enterprise macOS environments.
• Extensive experience with Microsoft ecosystem technologies, including Windows Server, Active Directory, Group Policy, DNS, DHCP, and Microsoft Entra .
• Experience managing macOS devices using MDM platforms such as Jamf Pro, Microsoft Intune, Kandji, or similar solutions.
• Experience with federal security and compliance frameworks, including NIST, FISMA, and enterprise vulnerability management programs.
• Strong automation and scripting skills using Power Shell, Python, Bash, and related automation frameworks.
• Experience supporting virtualization and cloud environments, including Microsoft Azure, AWS, VMware, and Hyper‑V.

• Ability to obtain a security clearance.
• This work is normally completed in a remote and on‑site environment.

• Prolonged periods of sitting at a desk and working on a computer.
• Must be able to access and navigate each department at the organization’s and client facilities.

• Travel may be required on an as‑needed basis.
• The employee is expected to demonstrate proficiency in all essential job functions, tools, and processes related to this position within the first 90 days of employment. This includes acquiring a thorough understanding of job‑specific responsibilities, systems, and workflows as outlined during onboarding and training. Failure to meet this requirement may result in additional training,…