365 Admin and Help Desk Manager

Three Saints Bay, LLC.a government contracting industry leader, isseeking an experienced 365 Admin and Help Desk Manager to lead our IT operations with a strong focus on Microsoft 365 cloud ecosystem, endpoint management, security operations, and compliance with CMMC (Cybersecurity Maturity Model Certification) and NIST SP 800-171 requirements. This is a hybrid position reporting into either our Manassas, VA office or our Charleston, SC office.

The ideal candidate will oversee the administration and optimization of Microsoft Cloud tools while managing a help desk team to deliver efficient end-user support and troubleshooting. This role combines strategic leadership, technical expertise in Microsoft security and productivity solutions, and hands-on involvement in compliance and incident response for a secure, efficient IT environment (particularly suitable for organizations handling Controlled Unclassified Information (CUI) or working with DoD/federal requirements).

Key Responsibilities

• Lead the administration, configuration, and optimization of Microsoft 365 (M365) environments, including Exchange Online, Teams, OneDrive, SharePoint Online, and related services.

• Manage Microsoft Intune (Endpoint Manager) for device enrollment, compliance policies, configuration profiles, application deployment, Autopilot provisioning, security baselines, and endpoint security across Windows, iOS, Android, and macOS devices.

• Oversee Microsoft Defender (including Defender for Endpoint, Defender for Office 365, Defender for Identity) for threat protection, vulnerability management, and incident response.

• Administer Microsoft Sentinel for security information and event management (SIEM), threat hunting, analytics, and automated response workflows.

• Ensure the organization’s IT systems and processes comply with NIST SP 800-171 controls and CMMC Level 2 (or higher) requirements, including policy development, control implementation, gap analysis, audit preparation, System Security Plan (SSP) maintenance, and Plan of Action & Milestones (POA&M) tracking.

• Manage and mentor the help desk/support team , including staffing, training, performance management, shift scheduling, and escalation processes.

• Provide advanced troubleshooting and resolution for end-user issues related to M365 applications, device management, security alerts, access problems, and general IT incidents.

• Develop and enforce IT policies, procedures, and best practices aligned with zero-trust principles, conditional access, multi-factor authentication (MFA), data loss prevention (DLP), and compliance frameworks.

• Monitor system performance, security posture, and compliance metrics; generate reports for leadership and auditors.

• Bachelor’s degree in Information Technology, Computer Science, Cybersecurity, or a related field (or equivalent experience).

• 7+ years of progressive IT experience, including 4+ years in a managerial or supervisory role.

• 5+ years of hands-on expertise administering Microsoft 365 environments (E3/E5 preferred), with deep proficiency in:

• SharePoint Online (site management, permissions, governance).

• Intune (device management, compliance, Autopilot).

• Microsoft Defender suite.

• Microsoft Sentinel (SIEM/SOAR capabilities).

• Proven experience implementing and maintaining compliance with NIST SP 800-171 and CMMC frameworks (e.g., control mapping, self-assessments, remediation, or certification preparation).

• Strong background in managing a help desk or service desk team, including ticketing systems, SLAs, end-user troubleshooting, and customer service excellence.

• Experience with Microsoft Entra ID (Azure AD), conditional access policies, identity governance, and security baselines.

Preferred Qualifications

• Relevant certifications such as:

• Microsoft Certified: Azure Administrator Associate, Microsoft 365 Security Administrator, or equivalent.

• Microsoft Certified: Endpoint Administrator Associate.

• Certified Information Systems Security Professional (CISSP), CMMC Registered Practitioner (RP), or similar.

• Experience in regulated environments (e.g., DoD contractors, federal contractors, defense industrial base).

• Familiarity with Microsoft Purview, Power Automate, or Power BI for reporting/compliance.

• Knowledge of hybrid environments, Azure Government/GCC High (if applicable).

Hiring Range: $100,000- $120,000

VEVRAA Federal Contractor

Three Saints Bay, LLC and its subsidiaries offer a team-oriented working environment and the opportunity to work with exceptional, dedicated industry professionals. We offer our employees a comprehensive benefits package and the opportunity to take part in exciting projects with government and commercial clients, both domestic and international.