Senior Microsoft Infrastructure Administrator

Jobtailor; Washington, Northern (District of Columbia, KY); Hybrid; USD 150,000 - 190,000; Full time

Benefits offered by this job

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Job summary

Jobtailor in Washington DC is seeking a senior Microsoft infrastructure engineer to administer and optimize Microsoft 365, Azure Government, Entra identity governance, and Zero Trust architectures across FedRAMP environments.

You will lead service planning, policy enforcement, and incident response while mentoring junior staff and coordinating with NOC and ITSM teams. Strong security posture and certification requirements apply.

Qualifications

• Senior-level Microsoft infrastructure admin experience in enterprise environments.
• Proven expertise with Microsoft 365, Azure Government, and Entra in federal/private sectors.
• Strong skills in Intune, Defender for Endpoint, and Exchange Online administration.
• Experience implementing Zero Trust across Microsoft platforms and FedRAMP for Azure Government.
• Certified in MS-102, AZ-104, SC-300 or equivalent and eligible for Public Trust.

Responsibilities

• Provide expert admin, configuration, and engineering support for Microsoft 365.
• Lead planning and execution of service updates, rollouts, and changes under ITIL 4.
• Monitor service health, performance, and security posture; address issues proactively.
• Develop and maintain configuration standards, policies, and governance docs.
• Administer Exchange Online, Teams, and Defender for Office 365 configurations

Skills

Microsoft 365 Administration

Azure Government

Entra Identity Governance

Zero Trust Architecture

FedRAMP Compliance

PowerShell Scripting

RBAC / Least-Privilege

ITIL 4 Change Management

ITSM (ServiceNow)

Exchange Online Administration

Microsoft Defender for Endpoint

Purview Compliance

Teams Administration

Public Trust Eligibility

Education

MS-102: Microsoft 365 Administrator Expert

AZ-104: Microsoft Azure Administrator Associate

SC-300: Identity and Access Administrator Associate

Tools

ServiceNow

PowerShell

Job description

• Provide expert-level administration, configuration, and engineering support for the client's Microsoft 365 environment
• Lead planning and execution of Microsoft 365 service updates, feature rollouts, and configuration changes under ITIL 4 change management practices
• Monitor Microsoft 365 service health, performance, and security posture and proactively address issues
• Develop and maintain Microsoft 365 configuration standards, policies, and governance documentation
• Support Microsoft 365 license management and optimization
• Administer and engineer the client's Microsoft Azure Government environment
• Lead Microsoft Entra identity service integrations and administration, including IAL2 identity assurance, multi-factor authentication, and single sign-on
• Support Zero Trust Architecture through Entra identity, conditional access, and least-privilege access controls
• Manage Azure Government subscriptions, resource groups, RBAC, and policy enforcement
• Coordinate with Infrastructure and Platform Operations on Azure-hosted workloads and cloud infrastructure
• Support FedRAMP compliance for Azure Government services
• Lead Microsoft Endpoint Manager (Intune) administration and engineering for device management, compliance, and application deployment
• Manage Microsoft Defender for Endpoint configuration, policies, and incident response coordination
• Develop and maintain endpoint baselines, compliance policies, and security standards aligned with NIST SP 800-53
• Support Windows endpoint patch management and software deployment
• Coordinate with NOC and Service Desk teams on endpoint incidents and escalations
• Administer and engineer Exchange Online, including mail flow, transport rules, anti-spam/anti-phishing policies, and mailbox management
• Support Microsoft Teams administration, governance, meeting configurations, and A/V integrations
• Manage DMARC, DKIM, SPF, and Microsoft Defender for Office 365 configurations
• Coordinate on Microsoft Teams Rooms integration and support
• Troubleshoot complex Exchange Online and Teams incidents as senior escalation point
• Ensure Microsoft infrastructure complies with FISMA, NIST SP 800-53, FedRAMP, and client cybersecurity policies
• Administer Microsoft Purview compliance solutions, including data loss prevention and information protection
• Support Zero Trust Architecture principles under 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
• Report suspected or confirmed Microsoft infrastructure security incidents
• Serve as senior escalation point for complex Microsoft infrastructure incidents and problems
• Independently diagnose and resolve cross-domain infrastructure issues
• Manage the Microsoft infrastructure incident lifecycle in the Government ITSM platform
• Coordinate with NOC, Service Desk, network, and infrastructure teams
• Develop and maintain troubleshooting runbooks, escalation procedures, and knowledge base articles
• Provide technical guidance and mentoring to junior administrators
• Assign and prioritize Microsoft infrastructure work items aligned with Sprint commitments and operational priorities
• Ensure team cross-training across Microsoft infrastructure functions
• Conduct quality reviews of team members' work
• Support recruitment, onboarding, and professional development of Microsoft infrastructure personnel

Requirements

• Minimum 6–8 years of hands‑on enterprise Microsoft infrastructure administration and engineering experience
• Demonstrated experience administering and engineering Microsoft 365, Azure Government, and Microsoft Entra in a Federal or comparable enterprise environment
• Proven experience with Microsoft endpoint management using Microsoft Intune and Microsoft Defender for Endpoint
• Experience implementing and maintaining Zero Trust Architecture principles across Microsoft platforms
• Demonstrated experience in a Federal or private‑sector enterprise environment of comparable scale, complexity, and security posture
• Proven ability to independently resolve complex, cross‑domain Microsoft infrastructure problems at the enterprise level
• Experience with FedRAMP compliance for Azure Government services
• Expert‑level proficiency in Microsoft 365 administration, including Exchange Online, SharePoint, OneDrive, and Teams
• Expert‑level proficiency in Microsoft Azure Government and Azure Active Directory (Entra ID)
• Expert‑level proficiency in Microsoft Entra identity governance, conditional access, and privileged identity management
• Expert‑level proficiency in Microsoft Endpoint Manager (Intune) for device management and compliance
• Expert‑level proficiency in Microsoft Defender for Endpoint and Defender for Office 365
• Expert‑level proficiency in Microsoft Purview compliance solutionsExpert‑level proficiency in Exchange Online mail flow, security, and administration
• Expert‑level proficiency in role‑based access control (RBAC) and least‑privilege access management
• Strong working knowledge of Zero Trust Architecture and OMB M‑22‑09 implementation
• Strong working knowledge of NIST SP 800‑53 security controls as applied to Microsoft platforms
• Strong working knowledge of FedRAMP requirements for Microsoft GCC High or Azure Government
• Strong working knowledge of PowerShell scripting for Microsoft 365 and Azure administration
• Strong working knowledge of ITSM platforms (e.g., ServiceNow)
• Strong working knowledge of ITIL 4 change and incident management practices
• Strong working knowledge of enterprise network fundamentals relevant to Microsoft infrastructure
• Current and unexpired Microsoft Certified: Microsoft 365 Administrator Expert (MS‑102) certification required
• Current and unexpired Microsoft Certified: Azure Administrator Associate (AZ‑104) certification required
• Current and unexpired Microsoft Certified: Identity and Access Administrator Associate (SC‑300) certification required
• Must be able to obtain a Public Trust

Core Competencies

Demonstrates expert‑level proficiency in Microsoft 365 administration, Azure Government, and Microsoft Entra identity governance, with a strong focus on implementing Zero Trust Architecture principles and ensuring compliance with FedRAMP and NIST standards.

Highest‑signal resume keywords

• Microsoft 365 Administration
• Microsoft Azure Government
• Microsoft Entra Identity Governance
• Zero Trust Architecture Implementation
• FedRAMP Compliance

Hard Skills

• Microsoft Endpoint Manager (Intune)
• Microsoft Defender for Endpoint
• Exchange Online Administration
• Role‑Based Access Control (RBAC)
• PowerShell Scripting
• NIST SP 800‑53 Security Controls
• ITIL 4 Change Management
• ITSM Platforms
• Multi‑Factor Authentication
• Single Sign‑On

Soft Skills

• Technical Guidance
• Mentoring
• Problem Solving
• Collaboration
• Communication

Certifications & Qualifications

• Microsoft Certified: Microsoft 365 Administrator Expert (MS‑102)
• Microsoft Certified: Azure Administrator Associate (AZ‑104)
• Microsoft Certified: Identity and Access Administrator Associate (SC‑300)

Industry Keywords

• ITIL 4
• Zero Trust Architecture
• FedRAMP
• NIST SP 800‑53
• Public Trust

Tools & Technologies

• Microsoft Teams
• Microsoft Purview Compliance Solutions
• ServiceNow
• Azure Active Directory
• Microsoft Defender for Office 365