Exchange System Administrator SME

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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 sustainable. 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!

Leidos is seeking an Exchange Subject Matter Expert (SME) to support a large enterprise IT contract for the DOD. This role requires an individual with subject matter expertise developing and implementing on-prem Microsoft Exchange solutions in small, medium, and large enterprise environments including physical and virtual server technologies. Duties include conducting technical planning for hardware and software upgrades, review of implementation and upgrade guides, generation of Standard Operating Procedures (SOPs) and other documentation to assist with team’s O&M efforts. Perform requirements analysis, functional analysis, and requirements allocation with operations staff to meet customer’s intended timeline for upgrades. Conduct technical assessment, integration support, system testing for functionality and security compliance, and quality assurance of production implementation. Solutions include Microsoft Exchange 2019 and 2025 SE on-prem, M365 Exchange Online, and hybrid solutions spanning various classifications, size/scope, redundancy/resiliency, and mission requirements. The individual will provide systems and software administration support in a large, multi-enclave enterprise environment. This person will work in a team environment to ensure mission needs are met and ensure functionality of capabilities to customers. Individuals in this role may be required to perform technical software configuration, rebooting, and other remedial actions on servers in support of O&M.

Primary Tasks

• Individuals in this role may be required to remotely log into servers in order to perform technical software configuration, rebooting, and other remedial actions.
• Provide Tier 2/Tier 3 administration support for implementation, troubleshooting, maintenance, and monitoring for physical and virtual servers.
• Rapidly distinguish isolated user problems from enterprise-wide application and system problems. Advise Operations staff of root cause, recommended fix actions, and document resolution for future use.
• Collaborate with peers and other service lanes to perform network latency analysis to address slow connections and user experience issues.
• Direct effort to collect data, conduct analysis, develop, and implement solutions associated Problem Management guidelines.
• Establish and maintain comprehensive availability and capacity management solution using lessons learned and best business practices
• Provide follow-up reports (technical findings, feedback, resolution steps taken) for root cause analysis, operational assessment and process improvement initiatives.
• Support customer requirements in a 24/7/365 mission environment and be able to provide on-call support during outages occurring after hours.
• Update operations and monitoring documentation for 24/7/365 IT Operations Center (ITOC) personnel.
• Troubleshoot email routing and service disruptions impacted by ever evolving cyber security tools and policies – Ensure implementation/integration does not impact customers.
• Perform day-to-day oversight for Exchange Online system within an Office 365 hybrid/cloud environment.
• Manage roles, services, and permissions in accordance with Government Service Owner and Cyber Security mandates.
• Create, test, and implement PowerShell scripts to automate and standardize routine tasks and monitoring.

Basic Qualifications

• Experience with interacting with service lanes to handle service inquiries and problems.
• Extensive experience working as a Tier 2/3 System Administrator.
• Extensive experience with Office 365 and Microsoft Exchange 2016, 2019, and 2025 SE.
• Extensive knowledge of Email Journaling solutions.
• Extensive experience with Scripting/Automation through Exchange PowerShell or other scripting languages.
• Experience resolving highly complex problems using application of technical knowledge, factual reasoning, and proper interpretation of problem indicators.
• Experience developing and implementing solutions for upgrades to newer Exchange versions.
• Experience directing migrations between on-prem Exchange and M365 Exchange Online.
• Time management skills with the ability to work within an IT Service Management/ticketing system (ServiceNow) independently
• Strong oral and written communications skills with experience briefing senior government and military officials.
• Strong leadership and mentoring skills to guide and improve team skill composition.
• Track record of working effectively within a team, and support to peers toward improved processes and results.
• Ability to triage and properly classify incidents and prioritize work efforts accordingly
• Extensive experience with planning, deploying, and documenting patch and configuration updates
• Extensive knowledge of Disaster Recovery (DR) for High Availability (HA) for large, dispersed enterprise environments.
• Extensive experience with log reviews, incident analysis, and identification of issue trends and problem analysis.
• Experience with server/system patch management methodologies.

Clearance

• Due to the nature of the government contracts we support, US Citizenship is required.
• TS/SCI with specific Polygraph required for position or TS/SCI and willingness to obtain and maintain a poly.

Education

• Candidate must have a Bachelor's degree with 12 years of relevant experience, Master’s degree with 10 years, Associate's with 14 years, or High School Diploma with 16 years.

Required Certifications

• Candidate must, at a minimum, meet DoDM 8140.03 (previously DoD 8570) – IT System Admin Intermediate certification requirements (Cloud+, GICSP, SSCP, Security+ CE, GSEC, or higher)

Desired Certifications:

• Certification relating to Microsoft Certified Solutions Expert (MCSE) Certification or MCSA (Microsoft Certified System Administrator)
• Experience with troubleshooting within a Trellix/Windows Defender security environment
• Experience with backup and restore procedures utilizing NetBackup, VMware snapshots or other backup solutions prior to conducting major changes/upgrades

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:

October 28, 2026

Pay Range:

Pay Range $116,350.00 - $210,325.00

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.