Computer Network Defense (CND) Security Engineer

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.

Ready to make an impact? Join a team pushing the boundaries of cyber defense.

DABAOPP1

NITESONI

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:

July 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 $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.