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Senior Microsoft Infrastructure Administrator

System One -
Washington, DC

Quick Apply

Job Details

$130,000 - $145,000 a year
11 days ago

Benefits

Health insurance
Dental insurance
401(k)
Vision insurance
Life insurance

Qualifications

SSO
Cloud identity and access management (IAM)
Zero Trust security
Authorization controls implementation
FedRAMP
NIST SP 800-53
IT user and group management
Zero trust architecture design
Incident management software
Microsoft Exchange
FISMA
Public Cloud
Communication platforms
Email configuration (technical support)
Cloud service support
Incident management operations support
Azure AD
Data access controls implementation
Regulatory Frameworks (Architecture security)
Collaborative technology platforms
Microsoft Teams
SharePoint
UEM
Cloud compliance
Access control management
Data Loss Prevention
Segregation of duties analysis
PowerShell
Shell Scripting
Intune

Full Job Description

Senior Microsoft Infrastructure Administrator

Location: Remote, with occasional onsite support in Washington, DC
Employment requirements: Ability to work without sponsorship and the ability to obtain a Public Trust

Position Overview

System One IT is seeking a Senior Microsoft Infrastructure Administrator to support an enterprise federal environment. This individual will serve as a senior technical authority across Microsoft 365, Azure Government, Microsoft Entra ID, Exchange Online, Microsoft Teams, Intune, Defender, and related Microsoft cloud services.
The successful candidate will provide hands-on administration and engineering support, independently resolve complex cross-platform issues, lead Microsoft infrastructure improvements, and mentor junior administrators. This position requires strong technical ownership, sound judgment, and experience operating in a regulated federal or comparably secure enterprise environment.

Key Responsibilities

Microsoft 365 Administration

Administer and engineer Microsoft 365 services, including Exchange Online, SharePoint Online, OneDrive, and Microsoft Teams
Lead Microsoft 365 updates, feature rollouts, and configuration changes through established change-management practices
Monitor Microsoft 365 service health, performance, and security posture
Develop configuration standards, governance documentation, and technical procedures
Support Microsoft 365 licensing and service optimization
Evaluate Microsoft roadmap updates and recommend platform improvements

Azure Government and Entra ID

Administer Azure Government and Microsoft Entra ID services
Configure Conditional Access, multifactor authentication, single sign-on, identity governance, and Privileged Identity Management
Support Zero Trust initiatives through identity-based security controls and least-privilege access
Manage Azure subscriptions, resource groups, role-based access control, and policy enforcement
Support identity assurance requirements, including IAL2
Maintain Microsoft cloud services in alignment with FedRAMP and federal cybersecurity requirements

Endpoint Management and Security

Administer Microsoft Intune for device management, application deployment, configuration, and compliance enforcement
Manage Microsoft Defender for Endpoint policies and support security incident response
Develop endpoint security baselines aligned with NIST SP 800-53 requirements
Support Windows endpoint patching and software deployment
Troubleshoot complex endpoint enrollment, compliance, policy, and application issues

Exchange Online and Microsoft Teams

Administer Exchange Online mail flow, transport rules, mailbox configurations, and email security policies
Manage Microsoft Teams policies, governance, meetings, and service configurations
Configure and maintain DMARC, DKIM, SPF, and Microsoft Defender for Office 365
Support Microsoft Teams Rooms and audiovisual integrations
Serve as the senior escalation point for messaging and collaboration incidents

Security, Compliance, and Governance

Maintain Microsoft platform configurations in accordance with FISMA, FedRAMP, NIST SP 800-53, and organizational security requirements
Administer Microsoft Purview capabilities, including data loss prevention and information protection
Support Zero Trust Architecture aligned with NIST SP 800-207 and OMB M-22-09
Apply least-privilege and separation-of-duties principles
Support security assessments, audit evidence collection, and remediation activities

Incident Management and Technical Leadership

Serve as the senior escalation point for complex Microsoft infrastructure incidents
Independently diagnose and resolve cross-domain Microsoft platform issues
Maintain incident records, troubleshooting runbooks, technical procedures, and knowledge articles
Coordinate with service desk, network, security, and infrastructure teams
Mentor junior Microsoft infrastructure administrators
Review technical work for accuracy, quality, and adherence to standards

Required Qualifications

6 to 8 or more years of hands-on enterprise Microsoft infrastructure administration and engineering experience
Experience administering Microsoft 365, Azure Government, and Microsoft Entra ID in a federal or comparably regulated enterprise environment
Strong hands-on experience with Microsoft Intune and Microsoft Defender for Endpoint
Experience implementing Zero Trust principles across Microsoft platforms
Experience independently resolving complex Microsoft infrastructure issues
Knowledge of FedRAMP-authorized Microsoft services and federal security requirements
Strong PowerShell scripting skills for Microsoft 365 and Azure administration
Familiarity with ITSM platforms such as ServiceNow
Knowledge of ITIL change and incident management practices

Required Technical Expertise

Microsoft 365 administration
Exchange Online, SharePoint Online, OneDrive, and Microsoft Teams
Azure Government
Microsoft Entra ID
Conditional Access and Privileged Identity Management
Identity governance and role-based access control
Microsoft Intune
Microsoft Defender for Endpoint
Microsoft Defender for Office 365
Microsoft Purview
PowerShell
Zero Trust Architecture
FedRAMP, FISMA, and NIST SP 800-53

Required Certifications

Candidates must hold current, active versions of all three certifications:

Microsoft Certified: Microsoft 365 Administrator Expert
Microsoft Certified: Azure Administrator Associate, AZ-104
Microsoft Certified: Identity and Access Administrator Associate, SC-300

Preferred Certifications

Microsoft Certified: Azure Solutions Architect Expert, AZ-305
Microsoft Certified: Security Operations Analyst Associate, SC-200
Microsoft Certified: Information Protection and Compliance Administrator Associate, SC-400
CompTIA Security+ or an equivalent security certification

System One, and its subsidiaries including Joulé and Mountain Ltd., are leaders in delivering outsourced services and workforce solutions across North America. We help clients get work done more efficiently and economically, without compromising quality. System One not only serves as a valued partner for our clients, but we offer eligible employees health and welfare benefits coverage options including medical, dental, vision, spending accounts, life insurance, voluntary plans, as well as participation in a 401(k) plan.

System One is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex (including pregnancy, childbirth, or related medical conditions), sexual orientation, gender identity, age, national origin, disability, family care or medical leave status, genetic information, veteran status, marital status, or any other characteristic protected by applicable federal, state, or local law.

#M1
#LI-CS1
Ref: #851-Rockville-S1

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Senior Microsoft Infrastructure Administrator

Position Overview

Key Responsibilities

Microsoft 365 Administration

Azure Government and Entra ID

Endpoint Management and Security

Exchange Online and Microsoft Teams

Security, Compliance, and Governance

Incident Management and Technical Leadership

Required Qualifications

Required Technical Expertise

Required Certifications

Preferred Certifications