Principal Endpoint Security Systems Engineer

Leidos has an exciting opportunity a Principal Endpoint Security Systems Engineer in our Intel Security Sector's Analysis Solutions Business Area. 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 SummaryThis effort is seeking an experienced endpoint security systems engineer to join our Cyber Security Engineering team. The focus of this team member will be to design, deploy, maintain, and upgrade endpoint security capabilities, with opportunities for cross training on our other security tools. Working in a hybrid cloud/on-prem mission environment the engineer will support integration of Linux and Windows hosted mission systems with the endpoint security product and maintaining the scan policies to ensure proper protection of mission systems from external threats.Primary ResponsibilitiesMaintaining and upgrading the central management consoles (currently Trellix - ePolicy Orchestrator) on multiple isolated networksManaging the integration of mission application servers (Linux and Windows) with the management consoleDeploying malware protection software (currently Trellix Endpoint Threat Protection) updates and improved scan exclusion policies to mission application serversResponding promptly to mission teams to successfully troubleshoot issues with integration (including cases where excessive real time malware scans are believed to be impeding mission performance)Determine methods to automate and improve the performance of the endpoint security suite within a hybrid cloud/on-prem environmentIntegrate endpoint security scan processes for integrated reporting via external tools (such as Splunk or AppDynamics)Investigate findings of malware detected on mission application serversBasic QualificationsExperience with tools such as Trellix ePolicy Orchestrator and Trellix Endpoint Threat ProtectionExperience with maintaining systems on Linux and Windows platformsAbility to partner with mission application teams to jointly troubleshoot issues with endpoint security integrationExperience with incident detection, incident response and forensics activitiesStrong attention to detail with analytical mind and outstanding problem-solving skillsBachelor’s degree with at least 12 or more years relevant experience. Additional years of experience may be substituted in lieu of a degree.To be considered must have an active TS/SCI with polygraph security clearancePreferred QualificationsExperience with Cisco Secure Endpoint (formerly AMP for Endpoints) or other endpoint security toolsExperience with Cloud Computing Technologies/Amazon Web Services (AWS)Experience integrating endpoint security tool findings with external products such as Splunk or AppDynamicsExperience with managing endpoint security across on-prem and cloud environment boundariesExperience with additional cyber security tools and processes such as Splunk, Rapid7, SolarWinds, Cisco IDS/IPS, VPN, WebInspect, AppDetectiveAt 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.CABARESTONIf 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:January 21, 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 $131,300.00 - $237,350.00The 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: Bethesda, MDType: Full time