Senior Systems Administrator - MS Exchange
- Market Salary: $72,810 - $146,850 p/year
- IT
- Full-time
Description
Leidos is seeking an experienced Senior System Administrator with team leadership and Microsoft Exchange skills to support the DTRA I3TS Infrastructure Services team to support, maintain and optimize critical mission operations across multiple geographic locations. The ideal candidate will be a technical expert responsible for installation, configuration, security, operation, and maintenance of servers, equipment, and software related to Microsoft Windows server and Exchange.
Candidates must demonstrate a high degree of problem-solving ability in a complex environment and be able to communicate effectively, both to the customer and to team members.
Primary Responsibilities:
Lead a team of seven or more System Administrators with Windows expertise to fulfill DoW customer requirements in a fast-paced, challenging work environment
Perform OS installation, configuration, hardening, and patching in compliance with DoD STIGs and agency policies.
Monitor and tune system performance, conduct root cause analysis, and resolve complex issues quickly and efficiently.
Oversee and maintain automation scripts and infrastructure as code (Ansible, PowerShell, Bash, etc.).
Implements Windows based security, including but not limited to group permissions, file / folder permissions, group policies, local security policies, etc.
Manage user accounts, credentials, permissions, access rights, storage allocations, and active directory administration.
Monitor system performance and respond to alerts.
Coordinate with customers and stakeholders to collect data, conduct analysis, develop, and implement solutions associated with incident tickets and requirements.
Design, implement, and maintain Active Directory enterprise environments including:
Active Directory Domain Services (AD DS).
Group Policy design and governance.
DNS and DHCP services.
Directory replication and trust models.
Install, configure, and upgrade Exchange Server environments and Active Directory.
Monitoring server health, mail flow, and database integrity to ensure high availability.
Create/manage mailboxes, shared mailboxes, distribution groups, and manage user access and permissions.
Resolve complex email, mail routing, and client connectivity issues.
Be able to work in a fast-paced environment and must be able to work independently.
Work on multiple projects, leading projects that fall within the Area of responsibility.
Communicate with internal team members across multiple areas and client team members.
Provide support on a M-F business hours schedule, also responsible for on-call, extended hour, and weekend support as required by mission or emergency situations.
Create, maintain, and implement detailed documentation and maintain standard operating procedures.
Basic Qualifications:
BS with 8-10 years, or MS degree with 6-8 years of experience in IT operations working with Windows, Linux servers and Virtualization.
Must hold a Top Secret/SCI Clearance.
Experience administering Microsoft Exchange Server.
Strong experience implementing and maintaining Security Technical Implementation Guides (STIGs).
Document STIG configurations and remediation actions to ensure audit readiness.
Conduct regular STIG compliance checks using tools like SCAP Compliance Checker and STIG Viewer.
Proficiency in PowerShell scripting and automation.
Strong problem-solving, analytical skills, and ability to work independently or in a team.
Hands-on experience administering Windows network environments.
DoD 8570 IAT Level II or III certification (e.g., Security+ CE, CASP+, CISSP).
Experience supporting IC or DoD classified environments.
Preferred Qualifications:
Microsoft certifications (MCSA, MCSE, Azure Administrator Associate)
Experience with automation and scripting (Ansible, Bash, PowerShell, Python).
Expert level knowledge on Active Directory, DNS, DHCP, Group Policy Object (GPO), Microsoft Clustering, domain architecture and performance tuning.
Working knowledge of virtualization, VMWare, or equivalent.
Experience supporting classified networks or cross-domain environments
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:
April 8, 2026For 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 $92,300.00 - $166,850.00The 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.
About Leidos
Leidos is an industry and technology leader serving government and commercial customers with smarter, more efficient digital and mission innovations. Headquartered in Reston, Virginia, with 47,000 global employees, Leidos reported annual revenues of approximately $16.7 billion for the fiscal year ended January 3, 2025. For more information, visit www.Leidos.com.
Pay and Benefits
Pay and benefits are fundamental to any career decision. That's why we craft compensation packages that reflect the importance of the work we do for our customers. Employment benefits include competitive compensation, Health and Wellness programs, Income Protection, Paid Leave and Retirement. More details are available at www.leidos.com/careers/pay-benefits.
Securing Your Data
Beware of fake employment opportunities using Leidos’ name. Leidos will never ask you to provide payment-related information during any part of the employment application process (i.e., ask you for money), nor will Leidos ever advance money as part of the hiring process (i.e., send you a check or money order before doing any work). Further, Leidos will only communicate with you through emails that are generated by the Leidos.com automated system – never from free commercial services (e.g., Gmail, Yahoo, Hotmail) or via WhatsApp, Telegram, etc. If you received an email purporting to be from Leidos that asks for payment-related information or any other personal information (e.g., about you or your previous employer), and you are concerned about its legitimacy, please make us aware immediately by emailing us at LeidosCareersFraud@leidos.com.
If you believe you are the victim of a scam, contact your local law enforcement and report the incident to the U.S. Federal Trade Commission.
Commitment to Non-Discrimination
All qualified applicants will receive consideration for employment without regard to sex, race, ethnicity, age, national origin, citizenship, religion, physical or mental disability, medical condition, genetic information, pregnancy, family structure, marital status, ancestry, domestic partner status, sexual orientation, gender identity or expression, veteran or military status, or any other basis prohibited by law. Leidos will also consider for employment qualified applicants with criminal histories consistent with relevant laws.