Principal Endpoint Security Systems Engineer

Fairygodboss; Bethesda (MD); On-site; USD 126,100 - 227,950; Full time

Benefits offered by this job

Competitive benefits

Flexible schedules

Education and training support

Parental paid leave

Job summary

A leading defense contractor in Bethesda seeks a Principal Endpoint Security Systems Engineer to design and maintain endpoint security systems. The ideal candidate has over 12 years of experience, expertise in managing Linux and Windows systems, and an active TS/SCI security clearance. This hybrid role offers competitive benefits including paid time off and 401K matching.

Qualifications

• Experience with tools such as Trellix ePolicy Orchestrator and Trellix Endpoint Threat Protection.
• Experience maintaining systems on Linux and Windows platforms.
• Ability to partner with teams to troubleshoot endpoint security integration.
• Active TS/SCI with polygraph security clearance required.

Responsibilities

• Maintaining and upgrading management consoles on networks.
• Managing integration of mission application servers.
• Deploying malware protection software updates.
• Investigating malware findings on application servers.

Skills

Experience with Trellix ePolicy Orchestrator

Experience with Linux and Windows platforms

Incident detection and response

Analytical mind

Problem-solving skills

Education

Bachelor’s degree with at least 12 years experience

Tools

Trellix Endpoint Threat Protection

Cisco Secure Endpoint

AWS

Splunk

Job description

Leidos has a new and exciting opportunity a Principal Endpoint Security Systems Engineer in our National Security Sector's (NSS) Cyber & Analytics Business Area (CABA). 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 Description

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. 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 – apply today.

CABARESTON

At Leidos, we don’t want someone who "fits the mold"—we want someone who melts it down and builds something better. This is a role for the restless, the over-caffeinated, the ones who ask, “what’s next?” before the dust settles on “what’s now.”

If you’re already scheming step 20 while everyone else is still debating step 2… good. You’ll fit right in.

Original Posting: August 28, 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 $126,100.00 - $227,950.00

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.