Senior Microsoft O365 Security Engineer & Subject Matter Expert-- Remote (Washington, DC)

Posted 2026-05-06
Remote, USA Full-time Immediate Start

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Title: Senior Microsoft O365 Security Engineer & Subject Matter Expert (SME)

Work Location: Washington, DC or Hybrid (1 day per week onsite/remote) - Potentially remote eligible pending customer approval.

duration: 6 months, possible extn.

Education & Experience: Bachelor of Science degree in Information Technology, Computer Science, or Engineering-related discipline and 10 years of prior relevant experience.

Senior Microsoft O365 Security Engineer & Subject Matter Expert (SME) to design and manage the implementation of Microsoft O365 security solutions across IT/OT environments. The M365 Security Engineer will provide the ISD with specialized expertise in configuring and deploying Microsoft 365 applications for securing the infrastructure and will be responsible for security configurations, compliance, identity and access management, and incident response across the Microsoft 365 ecosystem.

Primary Responsibilities

Provide strategic guidance, oversight and technical leadership for the organization s M365 application deployment across IT/OT environments

Implement and manage security solutions and compliance controls across the multi-tenant M365 ecosystem (MS Defender, Purview, Entra, Intune, One Drive, SharePoint, Teams)

Provide technical oversight and SME to MS Defender (EDR & Email Security), Purview (DLP & Compliance and Governance) activities and initiatives

Develop and implement strategies to MS Defender and Purview across on-Premise and Cloud environments (Azure & AWS)

Architect, design, and enhance MS Defender and Purview solutions and technologies

Perform risk assessments to identify gaps in MS Defender and Purview coverage

Research latest trends and threats in MS Defender and Purview and evasion techniques

Detailed understanding of M365 security products and tools

Interface with division stakeholders and facilitate technical working group/interchange meetings

Develop technical artifacts as part of M365 application deployment (requirements, architecture, test plan/scripts, implementation plans)

Collaborate with cross-functional teams to include Program/Project Management, M365 administrators, Data Center team, End User team, Security Engineering team, Security Operations Center (SOC), Compliance, and System Owners in the design and implementation of M365 security solutions

Apply systems & software development lifecycle in the development of design, test, and implementation artifacts

Coordinate with vendors and conduct analysis of alternatives (AoA) in evaluating M365 security solutions, controls and support Proof of Concept implementations

Develop scope, cost estimates, and implementation schedules for the deployment of M365 applications

Participate in the business continuity and Information Technology Disaster Recovery planning

Basic Qualifications

Ability to obtain Public Trust clearance

10+ years of experience providing technical leadership, guidance, and oversight for M365 security administration & deployments, security controls/compliance, telemetry, automation, and optimization

Strong hands-on experience designing and implementing end-to-end M365 security solutions across on-premises, hybrid, and cloud IT/OT environments

Possess strong technical knowledge of the M365 security architecture and security tools to include MS Defender, Purview, Entra, Intune, Sentinel, SharePoint, Teams

Experience utilizing MS Purview for data governance, DLP policy implementation, and eDiscovery

Experience utilizing MS Intune for GPO policy management

Experience deploying and managing MS Defender for threat protection

Experience configuring Entra ID for identity and access management

Experience with O365 integration, Azure AD, cloud services and security

Understanding of compliance requirements and security frameworks (NIST, ISO 27001, SOC2)

Proficiency in documenting and maintaining technical reports, procedures, architecture diagrams, and other relevant artifacts

Knowledge of threat vectors, vulnerabilities, risk assessment, and incident detection and response as part implementing M365 security controls

Ability to deliver formal presentations to the customer and stakeholders

Proven ability to work independently and as part of a collaborative environment

Excellent analytical, problem-solving, verbal and communications skills

Proficiency in PowerShell

Microsoft 365 administrator certifications such as MS-102, MS-900.

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