Leidos is seeking a Linux Systems Engineer to support a mission-critical customer environment in Chantilly, VA. This position is ideal for a hands-on Linux administrator or systems engineer with experience supporting Linux servers in virtualized environments and maintaining system security and compliance requirements. The successful candidate will support day-to-day system administration, engineering, configuration management, virtualization, and security operations across a multi-network environment. Candidates must currently possess an active TS/SCI with the required Polygraph and be eligible for customer crossover. Primary Responsibilities Administer, configure, maintain, and troubleshoot Linux-based systems and servers within a virtualized environment. Maintain the operational security posture of information systems and support day-to-day system security operations. Perform and support system vulnerability scans, security audits, remediation, and compliance activities. Implement and maintain system security configurations and requirements. Provide configuration management for information system hardware, software, firmware, and security components. Support system engineering activities, including planning, designing, analyzing, and improving hardware- and software-based system processes. Troubleshoot complex system and infrastructure issues and develop effective technical solutions. Support systems operating across multiple network environments. Work collaboratively with engineers, developers, technicians, analysts, and users to identify requirements and resolve technical issues. Investigate and document existing system architectures and configurations. Support operational systems in a dynamic mission environment. Basic Qualifications Active TS/SCI with the required Polygraph. Bachelor's degree and approximately 4 years of relevant experience. At least four years of recent experience supporting systems engineering, system administration, system processes, and/or software development methodologies. Demonstrated hands-on experience with Linux system administration and engineering. Experience maintaining the security posture of information systems, including system scans, security audits, and day-to-day security operations. Experience with configuration management of system hardware, software, firmware, and security components. Demonstrated ability to troubleshoot and solve complex technical problems. Experience working as part of a multidisciplinary technical team. Strong verbal and written communication skills. Preferred Qualifications Experience with Red Hat Enterprise Linux (RHEL). Experience implementing or maintaining DISA STIGs or similar system-hardening/security-compliance requirements. Experience with virtualization and container technologies such as VMware, Red Hat Virtualization, and Docker. Experience configuring, deploying, or maintaining Identity and Access Management (IdAM), Multi-Factor Authentication (MFA), and PKI-enabled systems. Experience translating user and developer use cases into technical system requirements. Experience documenting existing system architectures. Experience supporting operational mission systems. 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: September 14, 2026 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 $87,100.00 - $157,450.00 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. 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 $17.2 billion for the fiscal year ended January 2, 2026. 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 here. Securing Your Data Leidos will never ask you to provide payment-related information at any part of the employment application process. And Leidos will communicate with you only through emails that are sent from a Leidos.com email address. If you receive an email purporting to be from Leidos that asks for payment-related information or any other personal information, please report the email to spam.leidos@leidos.com. Commitment and Diversity 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.

Linux Systems Engineer – TS/SCI with Polygraph.

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