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Summary: Seeking an experienced Senior System Administrator with team leadership and Microsoft Exchange skills to support critical mission operations. Highlights: 1. Lead a team of System Administrators with Windows expertise 2. Install, configure, and upgrade Exchange Server environments 3. Design, implement, and maintain Active Directory enterprise environments Apply Now Description Leidos is seeking an experienced Senior System Administror with team leadership and Microsoft Exchange skills to support the DTRA I3TS Infrastructure Services team to support, maintain and optimize critical mission operions across multiple geographic locions. The ideal candide will be a technical expert responsible for installion, configurion, security, operion, and maintenance of servers, equipment, and software reled to Microsoft Windows server and Exchange. Candides must demonstre a high degree of problem-solving ability in a complex environment and be able to communice effectively, both to the customer and to team members. Primary Responsibilities: Lead a team of seven or more System Administrors with Windows expertise to fulfill DoW customer requirements in a fast-paced, challenging work environment Perform OS installion, configurion, hardening, and pching 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 automion 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 allocions, and active directory administrion. Monitor system performance and respond to alerts. Coordine with customers and stakeholders to collect da, conduct analysis, develop, and implement solutions associed 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 replicion and trust models. Install, configure, and upgrade Exchange Server environments and Active Directory. Monitoring server health, mail flow, and dabase integrity to ensure high availability. Cree/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 th fall within the Area of responsibility. Communice 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 situions. Cree, maintain, and implement detailed documention and maintain standard opering procedures. Basic Qualificions: BS with 8-10 years, or MS degree with 6-8 years of experience in IT operions working with Windows, Linux servers and Virtualizion. Must hold a Top Secret/SCI Clearance. Experience administering Microsoft Exchange Server. Strong experience implementing and maintaining Security Technical Implemention Guides (STIGs). Document STIG configurions and remediion actions to ensure audit readiness. Conduct regular STIG compliance checks using tools like SCAP Compliance Checker and STIG Viewer. Proficiency in PowerShell scripting and automion. 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 certificion (e.g., Security+ CE, CASP+, CISSP). Experience supporting IC or DoD classified environments. Preferred Qualificions: Microsoft certificions (MCSA, MCSE, Azure Administror Associe) Experience with automion 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 virtualizion, 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 stus 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 step 30 — and moving faster than anyone else dares. Original Posting: April 8, 2026 For U.S. Positions: While subject to change based on business needs, Leidos reasonably anticipes th this job requisition will remain open for least 3 days with an anticiped close de of no earlier than 3 days after the original posting de as listed above. Pay Range: Pay Range $92,300.00 - $166,850.00 The Leidos pay range for this job level is a general guideline only and not a guarantee of compension or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, educion, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market da, 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 innovions. Headquartered in Reston, Virginia, with 47,000 global employees, Leidos reported annual revenues of approximely $16.7 billion for the fiscal year ended January 3, 2025. For more informion, visit www.Leidos.com. Pay and Benefits Pay and benefits are fundamental to any career decision. Th's why we craft compension packages th reflect the importance of the work we do for our customers. Employment benefits include competitive compension, Health and Wellness programs, Income Protection, Paid Leave and Retirement. More details are available www.leidos.com/careers/pay-benefits. Securing Your Da Beware of fake employment opportunities using Leidos’ name. Leidos will never ask you to provide payment-reled informion during any part of the employment applicion 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 communice with you through emails th are genered by the Leidos.com automed system – never from free commercial services (e.g., Gmail, Yahoo, Hotmail) or via WhsApp, Telegram, etc. If you received an email purporting to be from Leidos th asks for payment-reled informion or any other personal informion (e.g., about you or your previous employer), and you are concerned about its legitimacy, please make us aware immediely by emailing us 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-Discriminion All qualified applicants will receive considerion for employment without regard to sex, race, ethnicity, age, nional origin, citizenship, religion, physical or mental disability, medical condition, genetic informion, pregnancy, family structure, marital stus, ancestry, domestic partner stus, sexual oriention, gender identity or expression, veteran or military stus, or any other basis prohibited by law. Leidos will also consider for employment qualified applicants with criminal histories consistent with relevant laws. Apply Now
