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# Senior System Administrator

- **Company:** IEM
- **Location:** United States (Remote available)
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Microsoft Access, Microsoft Windows, Active Directory, Microsoft Azure, Backup Devices, Microsoft Online Services, Cloud Computing, Cyber Security, Dynamic Host Configuration Protocol, Disaster Recovery, Domain Name System (DNS), Monitoring of Systems, Identity and Access Management, IT Management, Information Technology Operations, Windows Servers, Windows PowerShell, Azure Active Directory, Microsoft SharePoint, Software Vulnerability Management, Microsoft Power Automate, Microsoft InTune, Microsoft Sentinel, Data Management, Cloud Migration
- **Published:** November 14, 2026
- **Apply:** https://diversityjobs.com/career/18933317/Senior-System-Administrator-Texas

## About the Role

* Experience: Five(5) + years of progressive experience in enterprise systems administration, infrastructure engineering, or IT operations.
 * 5 years of hands-on experience in Microsoft 365 GCC High administration experience.
 * Certification :Microsoft 365 Certified: Administrator Expert (MS-102) certification required.
 * Clearance: Must be able to obtain and maintain a Department of War (DoW) Secret Security Clearance.
 * Extensive working knowledge of NIST SP 800-171 and DoW CMMC Level 2 requirements.
 * Demonstrated experience supporting Controlled Unclassified Information (CUI) environments.
 * Advanced knowledge of Microsoft Entra ID, Active Directory, Exchange Online, SharePoint Online, Teams, and Intune.
 * Strong Windows Server, enterprise infrastructure, and cloud administration experience.
 * Advanced PowerShell scripting and automation capabilities.
 * Experience implementing cybersecurity controls, identity management, and access policies.
 * Experience with enterprise backup, disaster recovery, and business continuity.
 * Excellent analytical, troubleshooting, communication, and problem-solving skills.

Preferred Qualifications:

 * Experience: Ten (10) years of progressive experience in enterprise systems administration, infrastructure engineering, or IT operations
 * Certification : Azure Administrator Associate or Azure Solutions Architect Expert.
 * Experience with Microsoft Defender XDR, Microsoft Sentinel, and Microsoft Purview.
 * Experience with CMMC Level 2 assessments, SSPs, POA&Ms, and remediation activities.
 * Experience supporting Department of War and federal government contracting environments.
 * Knowledge of ITIL, change management, and enterprise service management practices.

## Description

Microsoft 365 GCC High & Cloud Administration

 * Administer and maintain Microsoft 365 GCC High, including Exchange Online, SharePoint, OneDrive, Teams, and Microsoft Entra ID.
 * Manage Azure Government infrastructure, Microsoft Intune, Defender, and Microsoft Purview.
 * Administer enterprise licensing, identity management, security configurations, and access policies.
 * Implement and maintain MFA, Conditional Access, Privileged Identity Management (PIM), and endpoint compliance policies.
 * Develop automation using PowerShell, Microsoft Graph, and Power Automate.
 * Ensure Microsoft cloud configurations meet applicable federal security requirements.

Cybersecurity, NIST & CMMC Compliance

 * Implement and maintain security controls supporting NIST SP 800-171 and DoW CMMC Level 2 requirements.
 * Protect and manage Controlled Unclassified Information (CUI) environments.
 * Support development and maintenance of System Security Plans (SSPs), Plans of Action and Milestones (POA&Ms), and compliance documentation.
 * Support security assessments, vulnerability remediation, continuous monitoring, and compliance audits.
 * Maintain technical configurations and evidence required to demonstrate compliance.
 * Collaborate with security teams, compliance personnel, and external assessors.

Enterprise Infrastructure & Systems Administration

 * Administer Windows Server, Active Directory, Group Policy, DNS, DHCP, and enterprise authentication services.
 * Manage virtualization, enterprise storage, backup, and disaster recovery solutions.
 * Monitor system performance, availability, capacity, and security.
 * Manage patching, upgrades, vulnerability remediation, and infrastructure lifecycle management.
 * Troubleshoot complex enterprise infrastructure and application issues.

Technical Leadership & Automation

 * Serve as the senior technical escalation point for complex infrastructure and Microsoft 365 issues.
 * Lead infrastructure modernization, cloud migration, and cybersecurity projects.
 * Develop PowerShell scripts and automation to improve operational efficiency.
 * Establish infrastructure standards, technical documentation, and operational procedures.
 * Provide technical guidance and mentorship to IT personnel.
 * Partner with IT leadership on technology strategy, budgeting, and infrastructure planning.