Computer Network Defense (CND) Security Engineer

Via Logic LLC; Suitland (MD); On-site; USD 107,900 - 195,050; Full time

Job summary

Leidos in Suitland, MD, seeks a Computer Network Defense Security Engineer to analyze threats, investigate security events, and support Windows, Linux, and VMware environments.

You will work with Splunk, ePO, ACAS, and RMF, building dashboards, applying STIGs, and contributing to documentation. A TS/SCI clearance and CND experience are required.

Qualifications

• Bachelor’s degree with 8+ years of experience, or Master’s with 6+ years of experience. Additional experience or certifications may substitute for a degree.
• Active TS/SCI (in DISS).
• Active IAT Level II (Security+ CE preferred).
• Linux administration experience (RHEL).
• 3+ yrs CND experience.
• Hands-on experience with Splunk, Trellix ePO, ACAS, RMF.

Responsibilities

• Monitor and analyze events in Trellix ePO, Splunk, Palo Alto, and RSA.
• Investigate endpoint alerts (malware, rogue systems, removable media).
• Build dashboards, run ACAS scans, assist with remediation.
• Apply STIGs, perform patching, manage SCAP scans.
• Contribute to RMF documentation and system/network diagrams.

Skills

TS/SCI clearance

CND experience

IAT Level II

Linux administration

Education

Bachelor’s degree + 8+ years

Master’s degree + 6+ years

Tools

Splunk

Trellix ePO

ACAS

RMF

Nessus

Job description

Computer Network Defense (CND) Security Engineer

Suitland, MD

Join a mission driven cyber team in Suitland, MD, protecting critical Defense networks. In this role, you’ll analyze threats, investigate security events, run ACAS/Splunk operations, and support cutting edge cybersecurity technologies across Windows, Linux, and VMware environments.

What You’ll Do:

• Monitor and analyze events in Trellix ePO, Splunk, Palo Alto, and RSA.
• Investigate endpoint alerts (malware, rogue systems, removable media).
• Build dashboards, run ACAS scans, assist with remediation.
• Apply STIGs, perform patching, manage SCAP scans.
• Contribute to RMF documentation and system/network diagrams.

Required:

• Bachelor’s degree with 8+ years of experience, or Master’s with 6+ years of experience. Additional experience or certifications may substitute for a degree.
• Active TS/SCI (in DISS).
• Active IAT Level II (Security+ CE preferred.
• Linux administration experience (specifically RHEL).
• 3+ yrs CND experience.
• Hands-on experience with Splunk, Trellix ePO, ACAS, RMF.

Preferred:

• VMware ESXi.
• ACAS/Nessus expertise.

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.

Original Posting:

July 21, 2026

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.

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.