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. 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. 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 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