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From the employer's careers site First seen 27 Oct 2026

Countermeasures Engineer

Leidos Shiloh, IL senior full-time

Salary

$87,100 - $157,450 per year

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Description

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.

Your Mission

Countermeasure Development & Deployment:

  • 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.

Automation & Engineering Excellence:

  • 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.

Threat Intelligence & Situational Awareness:

  • 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 posture.

What You Bring

Required Qualifications:

  • 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.

Highly Desired Experience:

  • 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.

Skills

Required

  • Python
  • Java
  • Ruby
  • C++
  • TCP/IP
  • network protocols
  • OSI model
  • UNIX/Linux administrative skills
  • DoD 8570 IAT Level II certification
  • CSSP-A certification
  • Top-Secret Clearance

Nice to have

Ready to apply?

You apply with the employer directly. Their original posting is here: https://leidos.wd5.myworkdayjobs.com/en-US/External/job/Shiloh-IL/Countermeasures-Engineer_R-00193360

Apply on Leidos