System Administrator III - Windows/macOS

GAMA-1 Technologies • Key Biscayne, FL

6d • Hybrid

About The Position

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 ID) 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.

Requirements

• 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 ID.
• 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 PowerShell, 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.

Responsibilities

• 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 ID, and MDM platforms (Jamf Pro, BigFix, MECM, ManageEngine, 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 PowerShell, Python, Bash, AppleScript, 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.

Benefits

• health insurance coverage
• life and disability insurance
• 401(k) savings plan
• training and career development opportunities
• paid holidays
• paid time off (PTO - to cover vacation, illness or disability, appointments, emergencies or other situations that require time off from work)

What This Job Offers

• Job Type: Full-time
• Career Level: Senior