Microsoft 365 / SharePoint Administrator (IT Customer Support Services)

G2IT•Quantico, VA

7h•$75,000 - $85,000•Hybrid

About The Position

G2IT is seeking a Microsoft 365 / SharePoint Administrator to support and maintain an enterprise collaboration environment serving more than 13,000 users across NIPRNet, SIPRNet, and planned JWICS environments for a Department of War agency. The role administers Microsoft 365 services, including SharePoint Online, Microsoft Teams, Exchange Online, and OneDrive, with a focus on collaboration platform administration, user access management, system performance, security compliance, and troubleshooting complex technical issues. The administrator also supports enterprise endpoint management solutions and secure systems in accordance with DoD cybersecurity requirements. The role works with government stakeholders, technical teams, and vendors to maintain the availability, security, performance, and operational continuity of collaboration services and endpoint environments. The position is based in Quantico, Virginia, with hybrid work and remote work eligibility, up to 10% travel, and participation in an after-hours on-call rotation.

Requirements

Bachelor's degree and a minimum of 3 years of related experience; an additional 4 years of relevant experience may be substituted for the degree.
Must be a U.S. Citizen.
Must possess an active DoD Secret clearance (favorably adjudicated T3/T3R).
Must possess and maintain a current DoD 8570/8140 IAT Level II certification, such as CompTIA Security+ CE, CySA+, GSEC, SSCP, or CCNA-Security.
Minimum of 3 years of experience administering Windows endpoint environments supporting 5,000+ devices.
Experience administering or supporting enterprise Microsoft 365 environments, including SharePoint Online, Microsoft Teams, Exchange Online, and OneDrive.
Experience managing SharePoint permissions, site configurations, user access, and collaboration services.
Hands-on experience with Microsoft Endpoint Configuration Manager (MECM/SCCM) and/or Microsoft Intune.
Experience with software deployment, operating system patching, endpoint imaging, and compliance reporting.
Strong knowledge of Windows 10/11, Active Directory, Group Policy, PowerShell scripting, and Windows Server fundamentals.
Experience applying DISA STIGs and maintaining STIG-compliant operating system configurations.
Familiarity with STIG Viewer, SCAP tools, and vulnerability management solutions such as ACAS/Nessus.
Experience supporting vulnerability remediation and tracking Plans of Action and Milestones (POA&Ms).
Experience working within formal Change Management processes and scheduled maintenance windows.
Ability to participate in an after-hours on-call rotation.
Strong troubleshooting, analytical, documentation, and communication skills.
Ability to work independently and collaborate with technical and non-technical stakeholders.

Nice To Haves

Microsoft 365 Certified: Administrator Expert.
Microsoft 365 Certified: Teams Administrator Associate.
Microsoft 365 Certified: Endpoint Administrator Associate.
SharePoint or Microsoft collaboration-related certifications.
Experience administering Microsoft 365 GCC High environments.
Experience using PowerShell to automate Microsoft 365 and SharePoint administration.
Experience supporting DoD or Intelligence Community environments across NIPRNet, SIPRNet, and JWICS.
Experience with Microsoft Power Platform, including Power Automate and governance controls.
Experience with Virtual Desktop Infrastructure (VDI), including VMware Horizon, Citrix, or Azure Virtual Desktop.
Familiarity with BitLocker and enterprise encryption management.
Experience supporting RMF compliance documentation and eMASS.
Experience working with digital twin, laboratory, or pre-production environments for system testing and change validation.
Experience using ServiceNow for Incident Management, Request Management, Knowledge Management, CMDB, or Service Catalog functions.
Additional certifications such as CompTIA Security+ CE, CySA+, or CASP+ CE.

Responsibilities

Administer and maintain Microsoft 365 services, including SharePoint Online, Microsoft Teams, Exchange Online, and OneDrive.
Manage SharePoint Online site provisioning, permissions, access controls, hub sites, and site architecture.
Configure and maintain Microsoft Teams policies, governance settings, and collaboration services.
Administer Microsoft Purview retention policies, compliance settings, and data governance controls.
Monitor Microsoft 365 service health, troubleshoot platform issues, and provide Tier II/III technical support.
Coordinate technical escalations with Microsoft and other vendors to resolve complex system issues.
Administer Zoom.gov and Adobe Connect accounts, security configurations, and integrations.
Support Microsoft Power Platform governance, including environment administration, connectors, and data loss prevention policies.
Implement Microsoft 365 configuration changes, feature updates, and service enhancements through formal Change Management processes.
Maintain system documentation, configuration records, and security compliance evidence supporting Risk Management Framework (RMF) requirements.
Ensure Microsoft 365 and collaboration services comply with applicable DISA STIGs and DoD cybersecurity policies.
Collaborate with technical teams to maintain service availability, system performance, and operational continuity.
Administer and maintain enterprise endpoint management solutions, including Microsoft Endpoint Configuration Manager (MECM/SCCM) and Microsoft Intune.
Monitor endpoint management infrastructure, client health, software distribution, and compliance reporting across multiple security environments.
Package, test, and deploy operating system updates, security patches, and third-party applications.
Monitor patch compliance and support remediation efforts in accordance with DoD security requirements.
Develop and maintain standardized Windows operating system images that comply with applicable DISA STIG requirements.
Support automated software deployment, system provisioning, and operating system imaging using task sequences and related tools.
Maintain endpoint configuration documentation and assist with vulnerability remediation and compliance reporting.
Participate in an after-hours on-call rotation.