About this opportunity
Leidos Inc lists this Countermeasures Engineer opportunity in shiloh, Illinois. Review the employer’s description below for duties, qualifications and application requirements.
Job description
Description
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.
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
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: Pay Range $87,100.00 - $157,450.00
The Leidos pay range for this job level is a general guideline onlyand 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.
About 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 $16.7 billion for the fiscal year ended January 3, 2025. For more information, visit
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 at
Securing Your Data
Beware of fake employment opportunities using Leidos' name. Leidos will never ask you to provide payment-related information during any part of the employment application process (i.e., ask you for money), nor will Leidos ever advance money as part of the hiring process (i.e., send you a check or money order before doing any work). Further, Leidos will only communicate with you through emails that are generated by the Leidos.com automated system - never from free commercial services (e.g., Gmail, Yahoo, Hotmail) or via WhatsApp, Telegram, etc. If you received an email purporting to be from Leidos that asks for payment-related information or any other personal information (e.g., about you or your previous employer), and you are concerned about its legitimacy, please make us aware immediately by emailing us at
If you believe you are the victim of a scam, contact your local law enforcement and report the incident to the U.S. Federal Trade Commission.
Commitment to Non-Discrimination
All qualified applicants will receive consideration for employment without regard to sex, race, ethnicity, age, national origin, citizenship, religion, physical or mental disability, medical condition, genetic information, pregnancy, family structure, marital status, ancestry, domestic partner status, sexual orientation, gender identity or expression, veteran or military status, or any other basis prohibited by law. Leidos will also consider for employment qualified applicants with criminal histories consistent with relevant laws.
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Who can apply
Review the original listing for work authorization, qualifications and employer requirements.