Principal Endpoint Security Systems Engineer

Leidos LLC; Plyers Mill Estates (MD); Hybrid; USD 131,000 - 237,000; Full time

Benefits offered by this job

PTO

11 paid Holidays

401K with 6% company match

Flexible schedules

Discounted stock purchase

Technical upskilling

Education and training support

Parental paid leave

Job summary

Leidos is seeking a Principal Endpoint Security Systems Engineer to design, deploy, maintain, and upgrade endpoint security across hybrid cloud and on‑prem environments. You will work with Trellix products on Linux/Windows mission systems and help integrate reporting with Splunk or AppDynamics.

The role requires strong incident response/forensics experience, a Bachelor’s degree or equivalent, and an active TS/SCI with polygraph clearance.

Qualifications

• Experience with Trellix ePolicy Orchestrator and Trellix Endpoint Protection.
• Experience maintaining Linux and Windows systems.
• Proven ability to troubleshoot endpoint security integration with mission apps.
• Experience in incident detection, response and forensics.
• Strong detail orientation and analytical problem solving.
• Active TS/SCI clearance with polygraph is required.

Responsibilities

• Maintain and upgrade central management consoles on isolated networks.
• Integrate mission servers with the management console and endpoint tools.
• Deploy malware protection updates and refine scan exclusions for mission systems.
• Troubleshoot integration issues with mission teams and optimize performance.
• Automate endpoint security workflows and reporting across hybrid environments.
• Correlate findings with external tools like Splunk or AppDynamics.

Skills

Trellix ePolicy Orchestrator

Trellix Endpoint Protection

Linux

Windows

Incident response

Forensics

Analytical thinking

Education

Bachelor’s degree or equivalent experience

Job description

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 Summary

This 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 Responsibilities

• Maintaining and upgrading the central management consoles (currently Trellix - ePolicy Orchestrator) on multiple isolated networks
• Managing the integration of mission application servers (Linux and Windows) with the management console
• Deploying malware protection software (currently Trellix Endpoint Threat Protection) updates and improved scan exclusion policies to mission application servers
• Responding 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 environment
• Integrate endpoint security scan processes for integrated reporting via external tools (such as Splunk or AppDynamics)
• Investigate findings of malware detected on mission application servers

Basic Qualifications

• Experience with tools such as Trellix ePolicy Orchestrator and Trellix Endpoint Threat Protection
• Experience with maintaining systems on Linux and Windows platforms
• Ability to partner with mission application teams to jointly troubleshoot issues with endpoint security integration
• Experience with incident detection, incident response and forensics activities
• Strong attention to detail with analytical mind and outstanding problem-solving skills
• Bachelor’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 clearance

Preferred Qualifications

• Experience with Cisco Secure Endpoint (formerly AMP for Endpoints) or other endpoint security tools
• Experience with Cloud Computing Technologies/Amazon Web Services (AWS)
• Experience integrating endpoint security tool findings with external products such as Splunk or AppDynamics
• Experience with managing endpoint security across on-prem and cloud environment boundaries
• Experience with additional cyber security tools and processes such as Splunk, Rapid7, SolarWinds, Cisco IDS/IPS, VPN, WebInspect, AppDetective At Leidos, the opportunities are boundless

At 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.

#CABARESTON #ASBA #HALO

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: January 21, 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 $131,300.00 - $237,350.00

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.

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 [e-mail].

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.