Host Based Security System Administrator (TS/SCI)

Mission One: Land The Job. Mission Two: Outdo What's Next. Come Leidos! Leidos is seeking an experienced a TS/SCI cleared Host-Based Security System (HBSS) Administrator to support the management, configuration, and maintenance of endpoint security infrastructure across Department of Defense (DoD) and federal government networks. The ideal candidate brings hands‑on experience with McAfee ePolicy Orchestrator (ePO) and the Trellix Security Platform Suite and operates comfortably within a compliance‑driven environment governed by DoD standards. The position requires on‑site job duties at Langley Air Force base, VA. Roles and Responsibilities Manage, deploy, and maintain HBSS/Trellix endpoint protection technologies across enterprise networks to monitor, detect, and respond to security events. Configure and fine‑tune HBSS modules including Host Intrusion Prevention System (HIPS), Data Loss Prevention (DLP), and Policy Auditor. Implement and maintain DISA Security Technical Implementation Guides (STIGs) to ensure systems remain audit‑ready for command inspections and authorization reviews. Oversee OS and application patch deployments through McAfee ePO; track vulnerabilities and support Information Assurance (IA) compliance efforts. Identify and isolate system anomalies; assist with incident response activities and coordinate with engineering and security operations teams to resolve HBSS point‑product issues. Monitor server and network health, generate compliance and exception reports, and brief leadership on system status as required. Support Authority to Operate (ATO) activities by maintaining accurate system documentation, POA&Ms, and security baselines. Coordinate with system owners and the ISSM/ISSO to ensure endpoint policies align with organizational security requirements. Basic Qualifications Bachelor’s degree in Computer Science, Cybersecurity, Information Technology, or a related field with 4-8 years of directly applicable experience. Additional years of relevant experience will be considered in lieu of degree. Must have a DoD TS/SCI Clearance. Certification: DoD 8570/8140-compliant certification at IAT Level II or higher – CompTIA Security+ CE required at a minimum. Work will occur at government facilities in the Hampton Roads area. Travel may be required to CONUS and OCONUS locations. 3-5 years of hands‑on experience administering HBSS, McAfee ePO, or the Trellix Security Platform Suite in a DoD or federal government environment, including deployment and management in a predominantly Red Hat Enterprise Linux (RHEL) environment. Working knowledge of DISA STIGs, NIST SP 800-53, and DoD IA policies and regulations; familiarity with Linux‑specific HBSS agent deployment, configuration, and troubleshooting. Proficiency in Red Hat Enterprise Linux (RHEL) administration – including RPM package management, SELinux policy, systemd services, and security baseline configuration – as well as Windows Server administration and OS patching. Preferred Qualifications Additional certifications such as CISSP, CISA, CEH, or vendor‑specific ePO/Trellix training and certification. Proficiency in scripting and automation (e.g., Bash, PowerShell, Python). Experience with Assured Compliance Assessment Solution (ACAS) / Tenable Nessus for vulnerability scanning and remediation tracking. Familiarity with Security Information and Event Management (SIEM) tools and integration with HBSS/Trellix event data. Experience supporting RMF Authorization packages, including development of System Security Plans (SSPs) and continuous monitoring activities. Red Hat certifications such as RHCSA or RHCE, or equivalent demonstrated Linux administration experience in a security‑focused role. Knowledge of scripting (Bash, Python, or PowerShell) for automating HBSS agent deployments, compliance checks, or ePO reporting tasks across mixed OS environments. Prior experience in a SOC, NOC, or Cyber Defense environment supporting 24/7 operations. Familiarity with cloud‑based endpoint security management or hybrid on‑prem/cloud ePO deployments. Pay Range Pay Range $87,100.00 - $157,450.00 Commitment to Non-Discrimination 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. #J-18808-Ljbffr