Microsoft 365 Systems Administrator

System One, Inc.; Atlanta (GA); On-site; USD 75,000 - 120,000; Full time

Job summary

System One, Inc. is seeking a Microsoft Systems Administrator (Microsoft 365 Security Administrator) to support, secure, and optimize our Microsoft 365 environment.

You will manage identity and access, endpoint security, email security, and compliance controls across the organization. Responsibilities include configuring Conditional Access, managing Intune, monitoring Defender alerts, governing Purview data protection, and collaborating with IT teams and vendors to ensure reliable, secure

Qualifications

• Experience administering Microsoft 365 environments.
• Hands-on experience with: Microsoft Intune, Microsoft Defender, Microsoft Purview, Conditional Access Policies, Entra ID (Azure AD), Exchange Online and email security.
• Experience managing Windows desktop environments and Microsoft cloud services.
• Knowledge of identity and access management, endpoint security, and Microsoft security best practices.
• Experience with Mimecast, Azure, or Windows Server administration.
• Experience supporting public sector, government, or regulated environments and knowledge of NIST, or other compliance frameworks.
• Microsoft certifications such as Microsoft 365 Administrator, Endpoint Administrator, Identity and Access Administrator, Security Operations Analyst or Azure Administrator

Responsibilities

• Configure and maintain Conditional Access Policies, multifactor authentication, and access controls.
• Administer Microsoft Intune for endpoint management, device compliance, application deployment, and updates.
• Monitor and manage Microsoft Defender security alerts and respond to security-related incidents.
• Support Microsoft Purview policies, including data protection, retention, and compliance requirements.
• Manage email security, respond to threats, and remediate vulnerabilities.
• Manage Windows endpoints and assist with Windows Server administration.
• Perform system monitoring, patch management, and vulnerability remediation.
• Maintain technical documentation and support IT projects and initiatives.
• Work with internal teams and vendors to ensure reliable and secure technology services.

Skills

Microsoft 365 administration

Identity and access management

Endpoint security

Security best practices

Regulatory/compliance knowledge

Public sector experience

Tools

Microsoft Intune

Microsoft Defender

Microsoft Purview

Conditional Access Policies

Entra ID / Azure AD

Exchange Online & email security

Mimecast

Azure

Windows Server administration

Windows desktop management

Job description

We are seeking a Microsoft Systems Administrator ( Microsoft 365 Security Administrator ) to support, maintain, and secure Microsoft 365 environments. This role will administer Microsoft O365 and email security services, manage user and device access, endpoint management, and maintain security controls across the organization.

Responsibilities

• Configure and maintain Conditional Access Policies, multifactor authentication, and access controls.
• Administer Microsoft Intune for endpoint management, device compliance, application deployment, and updates.
• Monitor and manage Microsoft Defender security alerts and respond to security-related incidents.
• Support Microsoft Purview policies, including data protection, retention, and compliance requirements.
• Manage email security, respond to threats, and remediate vulnerabilities.
• Manage Windows endpoints and assist with Windows Server administration.
• Perform system monitoring, patch management, and vulnerability remediation.
• Maintain technical documentation and support IT projects and initiatives.
• Work with internal teams and vendors to ensure reliable and secure technology services.

Qualifications

• Experience administering Microsoft 365 environments.
• Hands-on experience with: Microsoft Intune, Microsoft Defender, Microsoft Purview, Conditional Access Policies, Entra ID (Azure AD), Exchange Online and email security
• Experience managing Windows desktop environments and Microsoft cloud services.
• Knowledge of identity and access management, endpoint security, and Microsoft security best practices.
• Experience with Mimecast, Azure, or Windows Server administration.
• Experience supporting public sector, government, or regulated environments and knowledge of NIST, or other compliance frameworks.
• Microsoft certifications such as Microsoft 365 Administrator, Endpoint Administrator, Identity and Access Administrator, Security Operations Analyst or Azure Administrator

Why Join Us

• Join a growing IT team supporting modern Microsoft technologies in an environment focused on security, operational excellence, and continuous improvement.