Critical Infrastructure Penetration Tester

Critical Infrastructure Penetration Tester Critical Infrastructure Penetration Tester Get AI-powered advice on this job and more exclusive features. Direct message the job poster from Level Nine Group We are seeking an experienced and technically advanced penetration tester to join our Critical Infrastructure Assessment Team. This team is responsible for evaluating the security posture of networks, applications, embedded systems, and physical devices that support essential operations across regulated and high-availability environments. This is a remote-first role with occasional on-site requirements for physical or hardware testing. If you are located in or near Chicago, IL, your application will receive favorable consideration, as in-person collaboration is sometimes necessary for specialized scopes. Our projects go beyond routine vulnerability scans-they require thoughtful exploitation, creative problem solving, and a deep understanding of how systems interact within critical infrastructure ecosystems. Candidates must be comfortable working independently and collaboratively across complex environments, often blending application, network, and device-layer attack paths. Minimum Requirements: 3+ years of professional (employed) penetration testing experience, including real-world exploit development and assessment delivery. 2+ years of client-facing consulting experience, ideally in regulated or high-risk environments. Strong understanding of operating system internals and security hardening (Windows and/or Linux). Deep familiarity with network architectures, protocol behavior, and segmentation testing. Solid foundation in software development or computer science, enabling source code review, binary analysis, or test harness development. We are seeking an experienced and technically advanced penetration tester to join our Critical Infrastructure Assessment Team. This team is responsible for evaluating the security posture of networks, applications, embedded systems, and physical devices that support essential operations across regulated and high-availability environments. This is a remote-first role with occasional on-site requirements for physical or hardware testing. If you are located in or near Chicago, IL, your application will receive favorable consideration, as in-person collaboration is sometimes necessary for specialized scopes. Our projects go beyond routine vulnerability scans-they require thoughtful exploitation, creative problem solving, and a deep understanding of how systems interact within critical infrastructure ecosystems. Candidates must be comfortable working independently and collaboratively across complex environments, often blending application, network, and device-layer attack paths. Minimum Requirements: 3+ years of professional (employed) penetration testing experience, including real-world exploit development and assessment delivery. 2+ years of client-facing consulting experience, ideally in regulated or high-risk environments. Strong understanding of operating system internals and security hardening (Windows and/or Linux). Deep familiarity with network architectures, protocol behavior, and segmentation testing. Solid foundation in software development or computer science, enabling source code review, binary analysis, or test harness development. Assessment Process: All qualified candidates will undergo a technical interview and sample assessment, where your ability to demonstrate applied knowledge will be evaluated directly by practicing members of our team. Seniority level Seniority level Mid-Senior level Employment type Employment type Full-time Job function Job function Information Technology Industries IT Services and IT Consulting Referrals increase your chances of interviewing at Level Nine Group by 2x Sign in to set job alerts for Penetration Tester roles. Chicago, IL $81,000.00-$121,000.00 2 days ago Chicago, IL $120,000.00-$150,000.00 1 week ago Chicago, IL $90,000.00-$110,000.00 1 week ago Chicago, IL $123,000.00-$155,000.00 1 month ago Staff Security Engineer, Identity Defense Operations Network Security Engineer (NAC) - North Central (Remote in the U.S.) Network Security Engineer (WAF) - North Central (Remote in the U.S.) Risk and Compliance Analyst - US Based Remote Linux Cryptography and Security Engineer Chicago, IL $88,000.00-$121,000.00 2 months ago Chicago, IL $113,600.00-$150,520.00 2 weeks ago Chicago, IL $106,000.00-$146,300.00 2 weeks ago Greater Chicago Area $100,000.00-$135,000.00 5 days ago Sales Engineer - AppSec/Cloud Security - Chicago Security Architect - North Central region (Chicago, IL) Sales Engineer - AppSec/Cloud Security Chicago We're unlocking community knowledge in a new way. Experts add insights directly into each article, started with the help of AI. #J-18808-Ljbffr