Mid/Sr System Administrator
Leidos has a new and exciting opportunity for a Mid/Sr System Administrator in our Intel Sector's Cyber & Analytics Business Area (CABA). Our talented team is at the forefront in Security Engineering, Computer Network Operations (CNO), Mission Software, Analytical Methods and Modeling, Signals Intelligence (SIGINT), and Cryptographic Key Management. At Leidos, we offer competitive benefits, including Paid Time Off, 11 paid Holidays, 401K with a 6% company match and immediate vesting, Flexible Schedules, Discounted Stock Purchase Plans, Technical Upskilling, Education and Training Support, Parental Paid Leave, and much more. Join us and make a difference in National Security!
Job Summary
The selected individual will provide system administration support for a large, complex network environment with geographically distributed systems. The role supports system engineering requests by delivering solutions that meet operational needs, and by upgrading, sustaining, and maintaining existing capabilities. The candidate must be comfortable working in a fast-paced environment that includes multiple air-gapped systems, each with its own domain and supporting infrastructure. The position also requires maintaining a complex IT environment involving multiple users, as well as associated storage and network infrastructure. This role requires an energetic, focused, and driven individual who can adapt quickly to changing priorities. The candidate must demonstrate strong system administration and troubleshooting skills and work effectively with the team to execute a variety of network-centric system administration tasks.
Primary Responsibilities
The selected candidate will be responsible for installing applications, administering systems and processes, and ensuring issues are identified and resolved in a timely manner. This role also includes optimizing server and desktop configurations to support reliable, continuous, and efficient operations, as well as performing security management and application performance optimization activities.
Additional responsibilities may include:
- Administration/sustainment of a system that provides a web-based application for storing, sharing, and distributing information.
- Creating and maintaining complex server enclaves, including analyzing system scanning reports, patching, cert renewals, vulnerability management assessments, and active directory configurations.
- Identifying and correcting hardware and software issues.
- Responding to system administration, operations, and maintenance problems, and developing re-work solutions.
- Creating and maintaining documentation of complex server/network environments to ensure that clear, concise and accurate information is readily available for incident resolution.
- Communicating with users and external support personnel regarding system outages and upgrades and conferring with upper management regarding recommended resolution options.
Basic Qualifications
- Bachelor’s Degree in System Engineering, Computer Science, Information Systems, Engineering Science, Engineering Management, or a related technical field and at least 8 years of relevant experience. Additional experience may be substituted for a degree.
- Must have substantial experience working as a systems administrator providing direct support to large groups of end users and technical staff (developers, testers, engineers, etc.).
- Must have at least 5 years of hands-on experience supporting Linux and Microsoft-based servers and workstations.
- Must have at least 5 years of hands-on experience with operating system and application hardening, including DISA, best practices, and high-assurance environments.
- Must have at least 5 years of hands-on experience with software and hardware deployment, patch management, operating systems, and system backup and restore functions.
- Must be proficient with Windows Server 2016, 2019, and Active Directory.
- Ability to travel is required, including local area travel and occasional 1-2 week CONUS and OCONUS trips on an annual basis.
- Clearance Required: Must have TS/SCI with Polygraph.
Preferred Qualifications
- Experience building, configuring, and maintaining large, distributed Trellix ePO environments from the ground up
- Strong scripting experience with SALT and Python
- Hands-on experience with Red Hat 7/8, VMware, Apache Tomcat, IIS, SQL Server, and KVMs
- Experience supporting security accreditation and certification, advanced security protocols, and network security technologies, including PKI, SSP, multi-domain environments, and vulnerability assessment
- Experience with client and server virtualization, hardware installation and troubleshooting, system optimization, and related tools such as disk arrays, PowerShell, PowerCLI, HSMs, and NTP
- Solid understanding of information security principles, software security, and security architecture
At Leidos, the opportunities are boundless. We challenge our staff with interesting assignments that allow them to thrive professionally and personally. For us, helping you grow your career is good business. We look forward to learning more about you – apply today.
careers.leidos.com/CONMD
CSSKEY
CONMD
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:August 28, 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.
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.
Skills Required
- Bachelor's degree in System Engineering, Computer Science, Information Systems, Engineering Science, Engineering Management, or a related technical field, plus at least 8 years of relevant experience; additional experience may substitute for the degree
- Substantial experience as a systems administrator supporting large groups of end users and technical staff
- At least 5 years of hands-on experience supporting Linux and Microsoft-based servers and workstations
- At least 5 years of hands-on experience with operating system and application hardening, including DISA practices and high-assurance environments
- At least 5 years of hands-on experience with software and hardware deployment, patch management, operating systems, and backup and restore functions
- Proficiency with Windows Server 2016, Windows Server 2019, and Active Directory
- Ability to travel locally and on occasional 1- to 2-week CONUS and OCONUS trips annually
- TS/SCI with Polygraph security clearance
- Experience building, configuring, and maintaining distributed Trellix ePO environments
- Strong scripting experience with SALT and Python
- Experience with Red Hat 7/8, VMware, Apache Tomcat, IIS, SQL Server, and KVMs
- Experience with security accreditation and certification, advanced security protocols, PKI, SSP, multi-domain environments, and vulnerability assessment
- Experience with virtualization, hardware installation and troubleshooting, disk arrays, PowerShell, PowerCLI, HSMs, and NTP
- Understanding of information security principles, software security, and security architecture
Leidos Compensation & Benefits Highlights
The following summarizes recurring compensation and benefits themes identified from responses generated by popular LLMs to common candidate questions about Leidos and has not been reviewed or approved by Leidos.
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Healthcare Strength — Healthcare coverage is described as comprehensive, with multiple plan options, low office-visit copays in some plans, and access to mental health and wellness support tools. The availability of HSA/FSA options and employer contributions is positioned as a meaningful part of the total package.
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Retirement Support — Retirement benefits are framed as a strong component of total rewards, highlighted by a 401(k) match and immediate vesting in the standard package. The Employee Stock Purchase Plan is also presented as an additional long-term wealth-building feature.
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Wellbeing & Lifestyle Benefits — Wellbeing and lifestyle supports extend beyond core insurance, including wellness programs, fitness-related stipends, and assistance resources. Work flexibility and related perks are also included as part of the broader rewards experience.
Leidos Insights
What We Do
We Are Leidos For 50 years we have been tackling some of the biggest problems that face our nation and our world. OUR MISSION Through our culture of innovation and history of performance, we develop deep customer trust built on integrity and create enduring solutions that improve our world. Leidos is a science and technology solutions leader working to address some of the world’s toughest challenges in the defense, intelligence, homeland security, civil, and healthcare markets. The company’s 43,000 employees support vital missions for government and commercial customers. Headquartered in Reston, Va., Leidos reported annual revenues of approximately $11.09 billion for the fiscal year ended January 3, 2020. Leidos was cited for the meaningful work employees perform that is challenging, impactful, and aligned with our customers’ missions as reasons professionals want to work and stay at our company. Leidos has also been named to lists including Forbes’ Best Employers for Diversity, Forbes’ America’s Best Employers for Women, Military Times Best for Vets Employers, and Ethisphere Institute’s World's Most Ethical Companies®. Employees enjoy career enrichment opportunities available through mobility and development and experience rewarding relationships with supportive supervisors and talented colleagues and customers. Employees appreciate our flexible work environment, allowing for and encouraging a true work-life balance. Our professionals are also excited about our Employee Resource Groups, like the newly launched Collaborative Outreach with Remote and Embedded Employees (CORE), which strives to create an environment where every employee, regardless of location, feels fully engaged as a valued employee of Leidos. Your most important work is ahead.
