Linux Systems Engineer - TS/SCI with Polygraph

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 ResponsibilitiesAdminister, 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 QualificationsActive 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 QualificationsExperience 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, 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 $87,100.00 - $157,450.00The 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.SummaryLocation: Chantilly, VAType: Full time