Senior Systems Administrator

About the role

The Senior Systems Administrator serves as a senior technical leader within the IT Infrastructure team. This role is responsible for the design, administration, security, and reliability of core enterprise systems, including on-premises and cloud infrastructure, identity and access management platforms, endpoint management solutions, and backup and recovery services.

Responsibilities

• Administer and maintain core infrastructure platforms, including Windows Server, virtualization environments, storage systems, and backup solutions
• Manage and secure Microsoft 365 and Microsoft Entra ID, including identity lifecycle management, Conditional Access, MFA, and privileged access controls
• Deploy, manage, and harden endpoint environments using Microsoft Intune, Group Policy, and endpoint security solutions
• Design, implement, and maintain backup, disaster recovery, and business continuity capabilities; regularly test and validate recovery procedures
• Perform system patching, vulnerability remediation, and security hardening across server and endpoint environments
• Support system-level incident response, containment, recovery, and post-incident remediation activities
• Develop and maintain system documentation, runbooks, diagrams, configuration standards, and asset inventories
• Lead infrastructure modernization initiatives, including cloud adoption, platform upgrades, and technology lifecycle management
• Provide technical guidance and mentorship to junior administrators and support personnel
• Collaborate with vendors and managed service providers to support operational and project-related objectives

Requirements

• Minimum of 5 years of experience in systems administration, infrastructure engineering, or a related technical discipline
• Strong hands-on experience with Windows Server administration, Microsoft 365 and Microsoft Entra ID, Active Directory and Group Policy, identity and access management, and backup and disaster recovery solutions
• Proven ability to troubleshoot and resolve complex infrastructure issues across multiple technologies
• Strong documentation, organizational, and operational discipline
• Excellent communication and collaboration skills
• U.S. Citizenship required

Preferred Qualifications

• Experience supporting regulated, government, aerospace, defense, or security-focused environments
• Familiarity with infrastructure controls supporting NIST 800-171, CMMC, DFARS, SOX, or similar compliance frameworks
• Experience with Conditional Access, Privileged Identity Management, Just-in-Time access, and identity governance solutions
• Experience managing hybrid environments spanning on-premises and Microsoft Azure workloads
• Experience supporting incident response, forensic preservation, and recovery operations
• Powershell scripting and infrastructure automation experience
• Microsoft certifications such as Azure Administrator, Microsoft 365 Administrator, Security Administrator, or related credentials
• Experience with virtualization platforms such as VMware or Hyper-V