M365 Exchange Online Administrator

Looking for an opportunity to make an impact?

At Leidos, we deliver innovative solutions through the efforts of our diverse and talented people who are dedicated to our customers’ success. We empower our teams, contribute to our communities, and operate sustainably. Everything we do is built on a commitment to do the right thing for our customers, our people, and our community. Our Mission, Vision, and Values guide the way we do business.

If this sounds like a mission you want to be a part of, keep reading!

The Digital Modernization Sector is focused on delivering performance-based IT services and repeatable solutions to include applying cloud-factory and aaS (as a Service) capabilities and integrating commercial products to provide a comprehensive digital engineering approach to IT transformation. Our team is solving the world’s toughest security challenges for customers with “can’t fail” missions. To explore and learn more, !

Candidates MUST:

Be located in the United States for the current three consecutive years.
Be a US Citizen or US Person with the ability to obtain and maintain a Public Trust clearance.
This is a telework position; however, the candidate must reside in the Washington, D.C., Northern Virginia, or Maryland area.

Leidos is seeking an experienced M365 Exchange Online Administrator (cloud) to join our Information Technology team. The ideal candidate will have deep expertise in managing and optimizing Exchange Online environments within GCC (Government Community Cloud) tenants, focusing on governance, security, compliance, and enhancing the organization's communication capabilities. This role requires a strategic thinker who can align Exchange Online services with organizational goals, particularly in a federal agency context. Other skills and responsibilities include, but are not limited to:

Key Responsibilities:

Strategic Oversight of Exchange Online Environment:

• Lead the management and optimization of the Exchange Online environment to ensure reliable, secure, and efficient email communication across the organization.

• Develop and enforce policies for email retention, sensitivity labeling, and classification to comply with federal regulations and organizational standards.

• Oversee the implementation of email-related security measures, including threat protection, to safeguard against evolving cyber threats and ensure compliance with federal security standards.

Governance and Compliance Management:

• Ensure the Exchange Online environment meets all federal compliance requirements, particularly those related to GCC tenants, including security, retention, and data governance policies such as capstone emails, email labeling and email encryption.

• Lead the integration of Microsoft Defender and Sentinel for comprehensive security monitoring and incident response, ensuring policies and automated response actions are aligned with organizational and regulatory requirements.

Collaboration and Continuous Improvement:

• Collaborate with cross-functional teams to align Exchange Online capabilities with organizational needs, driving improvements in email management, security, and user productivity.

• Stay current with updates and advancements in Exchange Online and related Microsoft 365 technologies, proactively implementing enhancements to improve service delivery and support organizational objectives.

• Utilize innovative tools and features, such as Copilot, to enhance the efficiency and effectiveness of email management practices within the organization.

Monitoring and Performance Optimization:

• Oversee the monitoring of email flow, usage patterns, and service health to proactively identify issues and opportunities for optimization.

• Ensure comprehensive documentation of system configurations, policies, procedures, and service records to support auditing, compliance, and future planning.

Leadership and Mentorship:

• Provide guidance and mentorship to junior IT staff, fostering a culture of continuous learning and professional development within the team.

• Act as a subject matter expert in Exchange Online administration, particularly in a federal agency context, to support strategic initiatives and organizational growth.

Required Qualifications and Experience:

• Bachelor’s degree in computer science, Information Technology, or a related field with a minimum of 12 years of relevant experience.

• Minimum of 5 years of hands-on experience in M365 administration.

• Strong understanding of M365 security and compliance capabilities.

• Excellent communication and collaboration skills.

• Working experience with a federal agency is highly desired.

Required Certifications:

• Possess one or more Microsoft 365 certifications. e.g., Microsoft 365 Certified: Messaging Administrator Associate, Enterprise Administrator Expert, Security, Compliance, and Identity Fundamentals.

Desired Skills:

• Expertise in managing M365 B2B collaboration and establishing trust relationships among multiple federal agencies.

• Experience with Multi-Tenant Organization (MTO).

• Proficiency in managing guest user access and secure external sharing within Exchange Online, ensuring secure and compliant communication.

• Familiarity with Entra ID B2B settings and Conditional Access policies for secure collaboration across organizations.

• Strong understanding of data governance and lifecycle management in a multi-tenant environment.

• Experience with Agile development methodologies.

• Proficiency with tools such as Jira, Confluence, and Zendesk.

Come join our rapidly growing team and enjoy these benefits:

• Paid Time Off (PTO) accrued based on Leidos policy, up to 3 weeks a year.

• Eleven (11) paid holidays per year.

• Access to benefits on day one including medical and dental insurance, 401K, Life, AD&D, Voluntary Disability plans.

• Ongoing training to support your success.

• Discounted Leidos stock purchase and other Employee Discounts.

If you're looking for comfort, keep scrolling. At Leidos, we outthink, outbuild, and outpace the status quo — because the mission demands it. We're not hiring followers. We're recruiting the ones who disrupt, provoke, and refuse to fail. Step 10 is ancient history. We're already at step 30 — and moving faster than anyone else dares.

Original Posting:

July 31, 2025

For U.S. Positions: While subject to change based on business needs, Leidos reasonably anticipates that this job requisition will remain open for at least 3 days with an anticipated close date of no earlier than 3 days after the original posting date as listed above.

Pay Range:

Pay Range $131,300.00 - $237,350.00

The Leidos pay range for this job level is a general guideline only and not a guarantee of compensation or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law.