Endpoint Security as a Service (ESS) Engineer

Leidos is seeking a skilled and driven Endpoint Security as a Service (ESS) Engineer and Systems Administrator to join our team at the Washington Navy Yard — where innovation meets mission. What You’ll Do As an ESS Engineer and Systems 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. You will ensure that our systems comply with the latest security patches and configurations. 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 DABAOPP1 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: June 30, 2026 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 $92,300.00 - $166,850.00 The 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. Leidos Leidos is an industry and technology leader serving government and commercial customers with smarter, more efficient digital and mission innovations. Headquartered in Reston, Virginia, with 47,000 global employees, Leidos reported annual revenues of approximately $17.2 billion for the fiscal year ended January 2, 2026. For more information, visit Pay and Benefits Pay and benefits are fundamental to any career decision. That's why we craft compensation packages that reflect the importance of the work we do for our customers. Employment benefits include competitive compensation, Health and Wellness programs, Income Protection, Paid Leave and Retirement. More details are available here. Securing Your Data Leidos will never ask you to provide payment-related information at any part of the employment application process. And Leidos will communicate with you only through emails that are sent from a Leidos.com email address. If you receive an email purporting to be from Leidos that asks for payment-related information or any other personal information, please report the email to View email address on click.appcast.io. Commitment and Diversity 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.