Countermeasures Engineer

Leidos • Shiloh, IL

5d

About The Position

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.

Requirements

• 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

Nice To Haves

• 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
• DevSecOps experience developing and supporting secure development environments
• Automation expertise using Bash, Python, PowerShell, 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

Responsibilities

• 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 DevSecOps 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.

Benefits

• 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.

What This Job Offers

• Job Type: Full-time
• Career Level: Senior