Sr. Endpoint Security Systems Engineer

Leidos; Bethesda (MD); Hybrid; USD 108,000 - 195,000; Full time

Job summary

Leidos is seeking a Sr. Endpoint Security Systems Engineer to design, deploy, and maintain endpoint security capabilities across hybrid cloud/on-prem mission environments.

You will integrate Linux and Windows hosted mission systems with Trellix solutions, manage central consoles, and refine scanning policies to protect critical assets. The role requires collaboration with mission teams, strong incident response experience, and an active TS/SCI with polygraph.

Qualifications

• Bachelor's degree required with 8+ years of relevant experience.
• Active TS/SCI with polygraph clearance required.
• Experience with Trellix tools and Linux/Windows environments.
• Strong problem solving and incident response capabilities.

Responsibilities

• Maintain and upgrade central management consoles across networks.
• Integrate mission servers with management consoles (Linux/Windows).
• Deploy endpoint protection updates and refine scan exclusions.
• Troubleshoot integration issues with mission teams.
• Automate performance improvements for endpoint security in hybrid cloud/on‑prem.

Skills

Endpoint security

Security engineering

Threat analysis

Team collaboration

Education

Bachelor’s degree in a technical field

Tools

Trellix ePolicy Orchestrator

Trellix Endpoint Threat Protection

Linux

Windows

Splunk

AppDynamics

Cisco Secure Endpoint

AWS

Rapid7

SolarWinds

Cisco IDS/IPS

Job description

Description

Join us and make a difference in National Security!

Leidos has an exciting opportunity for a Sr. 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: 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.

Job Summary

This effort is seeking an experienced Sr. 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 8 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. 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.

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

August 25, 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 $107,900.00 - $195,050.00

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.

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

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 at www.leidos.com/careers/pay-benefits.

Commitment to Non-Discrimination

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.