**Description** **Leidos is seeking a skilled and driven Endpoint Security as a Service (ESS) Engineer and Administrator to join our team at the Washington Navy Yard - where innovation meets mission.** **What You'll Do** As an ESS Engineer and Administrator, you won't just maintain systems - you'll _elevate_ them. You'll be part of a collaborative team that installs, configures, and fine-tunes advanced security solutions to ensure critical network infrastructure runs at peak performance. You'll also evaluate emerging technologies and shape the future of endpoint protection across a highly sensitive environment. **Your Impact Includes:** + Overseeing the full lifecycle of the ESS and its agents - install, manage, maintain, and optimize. + Creating and deploying custom ESS signatures and policies. + Proactively monitoring ESS for intrusions, failures, and performance anomalies. + Ensuring reliable and secure endpoint operations across all clients and servers. + Troubleshooting ESS deployments and policy rollouts across local and remote systems. + Conducting threat analysis and crafting custom security rules tailored to advanced exploits and vulnerabilities. + Providing in-depth reporting on system health, event trends, and module performance. + Supporting major updates and compliance efforts, including STIG-mandated Trellix upgrades. + Helping design and evaluate network components and develop cutting-edge technical solutions. **Basic Qualifications:** + Active **Top Secret clearance** (SCI eligible). + **8+ years of IT experience** , including 2+ years focused on ESS (or equivalent experience in lieu of degree). + **DOD 8570 IAT Level II** certification or higher. + Expertise in Windows Server 2016+ and endpoint platforms such as Trellix Agent, ENS FW, PA, DLP, RSD, and ePO. + Strong analytical skills with a knack for troubleshooting under pressure. **Preferred Qualifications:** + **TS/SCI clearance** and **DOD 8570 IAT Level III** certification. + Hands-on experience with RedHat Enterprise Linux, VMware, Microsoft Hypervisor, or RedHat VM Manager. + Familiarity with SADR environments and maintaining ePO servers. + Completion of Basic and Advanced ESS DISA training. If you're ready to take on one of the most vital roles in national security cyber defense - _let's talk_ . This is your chance to lead from the front in safeguarding critical systems at one of the country's most strategic sites. **Original Posting:** June 30, 2025 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 $89,700.00 - $162,150.00 The Leidos pay range for this job level is a general guideline onlyand 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. REQNUMBER: R-00161661 All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability or veteran status. Leidos will consider qualified applicants with criminal histories for employment in accordance with relevant Laws. Leidos is an equal opportunity employer/disability/vet.