365 Admin and Help Desk Manager (6249)

Three Saints Bay, LLC; Manassas (VA); Hybrid; USD 100,000 - 120,000; Full time

Job summary

Three Saints Bay, LLC is seeking an experienced 365 Admin and Help Desk Manager to lead IT operations with emphasis on Microsoft 365, endpoint management, security, and compliance with CMMC/NIST SP 800-171. Hybrid work options in Manassas, VA or Charleston, SC are available.

You will oversee Exchange Online, Teams, OneDrive, SharePoint Online, Defender, Sentinel, and Intune, while aligning policies to zero-trust and MFA requirements.

Qualifications

• Bachelor's degree in IT, CS, cybersecurity, or related field or equivalent experience.
• 7+ years IT experience with at least 4+ years in a managerial role.
• 5+ years hands-on experience administering M365 environments (E3/E5).

Responsibilities

• Lead the administration, configuration, and optimization of Microsoft 365 environments including Exchange Online, Teams, OneDrive, and SharePoint Online.
• Manage Intune for device enrollment, compliance, configuration, Autopilot, and security across devices.
• Oversee Defender for threat protection, vulnerability management, and incident response.
• Administer Sentinel for SIEM, threat hunting, analytics, and automated response workflows.
• Ensure IT systems comply with NIST SP 800-171 and CMMC Level 2+ requirements, including SSP and POA&M.
• Manage and mentor the help desk/support team, including staffing, training, and escalation.
• Provide advanced troubleshooting for M365 apps, device management, security alerts, and access issues.
• Develop IT policies aligned with zero-trust, MFA, DLP, and compliance frameworks.
• Monitor performance, security posture, and compliance metrics; report to leadership/auditors.

Skills

Leadership & team management

IT security operations

Policy development & compliance

End-user support & troubleshooting

Education

Bachelor's degree in Information Technology/CS/Cybersecurity

Tools

Exchange Online

SharePoint Online

Teams

OneDrive

Intune (Endpoint Manager)

Defender suite

Microsoft Sentinel

Azure Entra ID / Azure AD

Conditional access & MFA

NIST SP 800-171 / CMMC knowledge

Job description

Position Description

Three Saints Bay, LLC. a government contracting industry leader, is seeking 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 and NIST SP 800-171 requirements. This is a hybrid position reporting into either our Manassas, VA office or our Charleston, SC office.

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.

Required Qualifications

• 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.

We are an Equal Opportunity Employer. We invite resumes from all interested parties without regard to race, color, sex, sexual preference, religion, creed, national origin, age, genetic information, marital or veteran status, disability, or any other category protected by federal, state, or local law.