Endpoint Security Service; ESS Engineer

Description

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.

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.

• 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.

• 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.

• TS/SCI clearance and DOD 8570 IAT Level III certification.
• Hands‑on experience with Red Hat Enterprise Linux, VMware, Microsoft Hypervisor, or Red Hat 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.

Come break things (in a good way). Then build them smarter.

We’re the tech company everyone calls when things get weird. We don’t wear capes (they’re a safety hazard), but we do solve high‑stakes problems with code, caffeine, and a healthy disregard for how it’s always been done.

Pay Range $92,300.00 - $

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 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 $16.7 billion for the fiscal year ended January 3, 2025. For more information, visit

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 at

Beware of fake employment opportunities using Leidos’ name. Leidos will never ask you to provide payment‑related information during any part of the employment application process (i.e., ask you for money), nor will Leidos ever advance money as part of the hiring process (i.e., send you a check or money order before doing any work). Further, Leidos will only communicate with you through emails that are generated by the …