Countermeasures Engineer

Defend the Nation's Networks Through Innovation and Advanced Cyber Engineering Join the front lines of national defense as a Countermeasures Engineer supporting the GSM-O II program. You'll provide critical network operations and cyber defense support to the Defense Information Systems Agency (DISA), protecting DoD and Combatant Command networks from the world's most sophisticated adversaries.

Design and deploy innovative, custom countermeasures to neutralize advanced threats and expose adversary activities on Classified terrain. Develop cutting-edge malware detection capabilities tailored to emerging threat actor techniques Continuously evaluate countermeasure effectiveness against evolving Advanced Persistent Threats (APTs) and adjust strategies in real-time Apply Detection-as-a-Code principles to create scalable, version-controlled security solutions

Architect and build automated cybersecurity solutions that deliver enterprise-wide protection at scale Develop custom integrations, data correlation engines, and processing pipelines to reduce cyber risk across the DoD & Classified terrain. Conduct agile development and maintenance of automation scripts and tools using modern Dev Sec Ops  practices Serve as a Subject Matter Expert (SME) for the automation team, mentoring others and driving technical innovation

Maintain continuous awareness of the cyber threat landscape by analyzing DoD, Intelligence Community, and open-source intelligence reporting Identify new vulnerabilities, malware families, and threat actor TTPs that could impact mission-critical networks Translate threat intelligence into actionable defensive measures and detection capabilities Collaborate with DISA, mission partners, and Combatant Commands to enhance collective defense postur

• Active DoD Top-Secret Clearance Bachelor's degree in Computer Science, Cybersecurity, Computer Engineering, or related field with 8+ years of hands-on experience (or equivalent combination of education and experience)
• DoD 8570 IAT Level II certification (Security+ CE or equivalent) , CSSP-A certification required within 180 days
• Strong programming proficiency in at least one modern language:
  Python, Java, Ruby, or C++
• Proven experience developing custom malware detection capabilities
• Advanced understanding of: TCP/IP, network protocols, ports, and traffic flow analysis System administration across multiple platforms OSI model and defense-in-depth security architecture Common security elements and enterprise security technologies Deep knowledge of threat actor lifecycle, attack vectors, exploitation methods, and intrusion set Tactics, Techniques, and Procedures (TTPs) UNIX/Linux administrative skills

• Direct experience with DISA and DoD network environments
• Proven track record countering APTs and nation-state threats targeting DoD networks
• Advanced cybersecurity analytics development and implementation
• Dev Sec Ops  experience developing and supporting secure development environments
• Automation expertise using Bash, Python, Power Shell, or other scripting languages
• Linux and Windows system administration in cloud or virtualized environments (AWS, Azure, VMware)
• API development and integration experience
• Proficiency with security tools:
  Git, Sigma, Yara, Snort, Suricata
• Hands-on malware analysis using reverse engineering techniques
• Advanced certifications: GREM, OSCP, GCFA, CISSP, CASP, or GIAC

Why This Role Matters As a Countermeasures Engineer, you'll be a force multiplier for national defense. Your innovative solutions will protect critical DoD infrastructure, support warfighter operations, and defend against nation-state cyber campaigns. You'll work alongside elite cyber professionals, engage directly with Intelligence Community partners, and see the immediate impact of your work on national security.

Original Posting:
September 29, 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 $87,100.00 - $ 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…