Systems Engineer III

Position: Systems Engineer IIILocation: Melbourne, FL (Patrick SFB)Make an Impact with LeidosAt Leidos, we deliver innovative solutions through the dedication of our diverse and talented teams. United by a shared commitment to our customers' success, we empower our people, support our communities, and operate sustainably. Our Mission, Vision, and Values guide every aspect of our work, ensuring we do the right thing-for our customers, our people, and the world around us.Thrive in an Impactful EnvironmentThe Leidos Defense Sector offers a broad portfolio of systems, solutions, and services across land, sea, air, space, and cyberspace. We support critical defense missions with capabilities in enterprise and mission IT, large-scale intelligence systems, command and control, geospatial and data analytics, cybersecurity, logistics, training, and intelligence operations. Our teams tackle the world's toughest security challenges for customers with "can't fail" missions.Leidos Defense Sector is seeking a Systems Engineer III (Linux) to support the Air Force Technical Applications Center (AFTAC) U.S. National Data Center (US NDC). The US NDC operates a mission‐critical, high‐availability system within secure DoD environments supporting national security objectives.This role focuses on system engineering, platform sustainment, cybersecurity compliance, and DevSecOps integration across Linux and Solaris environments. The selected candidate will support COTS application installation and lifecycle management, system hardening, patching, upgrades, and 24×7 operational troubleshooting across classified and unclassified infrastructures. This is an opportunity to directly support a critical national security mission while ensuring system resilience, cybersecurity compliance, and operational excellence.Primary Responsibilities:* Engineer, administer, and sustain enterprise Linux and Solaris systems supporting mission applications* Install, configure, upgrade, and maintain Commercial Off-The-Shelf (COTS) software in secure environments* Lead system patching, upgrades, and vulnerability remediation to maintain cybersecurity compliance* Implement and maintain system hardening in accordance with DISA STIGs, RMF controls, DoD cybersecurity policies, and Zero Trust architecture principles* Troubleshoot complex system, application, and infrastructure issues in a 24x7 mission environment, performing root-cause analysis and resolution* Develop and maintain automation scripts and configuration management solutions (i.e. Ansible) to improve system consistency, compliance, and deployment repeatability* Collaborate with software, database, network, and cybersecurity teams to ensure reliable system integration* Support deployment pipelines and DevSecOps practices for system and application releases* Maintain system documentation, configuration baselines, and operational procedures* Participate in on-call rotation and operational sustainment activitiesBasic Qualifications:* Bachelor's degree in Information Technology, Computer Science, or related disciple with 4+ years of related experience. Additional experience, training, or certifications may substitute for degree* U.S. citizen; Currently possessing an Active DoD Top Secret clearance and eligibility for Top Secret/SCI* Currently hold a DoD 8140 IAT level II certification (e.g., CompTIA Sec+)* Experience administering Linux (RHEL or equivalent) systems in enterprise environments* Experience installing, configuring, and upgrading COTS software applications* Direct experience managing systems with Red Hat Satellite* Experience developing and maintaining Ansible automation for configuration management* Familiarity with Linux system hardening and security compliance practices* Strong troubleshooting experience in complex, integrated systems* Experience with system patching, lifecycle management, and vulnerability remediation* Familiarity with DISA STIGs, RMF, and DoD cybersecurity, and Zero Trust acrhitecture compliance requirementsPreferred Qualifications:* Experience in DevSecOps environments and CI/CD pipeline integration* Experience with automation tools (Ansible, Bash, Python)* Experience with virtualization platforms (VMware or similar)* Experience with containerization and orchestration technologies, including Docker and Kubernetes in a production environment* Experience supporting Oracle or other enterprise database environments* Experience modernizing legacy systems within secure environments* Experience supporting or administering Solaris systemsReady to make an impact? Start your meaningful career journey with Leidos-submit your resume today!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:March 4, 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.