Critical Infrastructure Penetration Tester

Level Nine Group; Chicago (IL); Remote; USD 81,000 - 155,000; Full time

Job summary

A leading IT Services and Consulting firm seeks an experienced Penetration Tester to evaluate and enhance the security of critical infrastructure components. The ideal candidate will possess strong technical expertise in penetration testing, exploit development, and a solid understanding of OS internals, with opportunities for remote work.

Qualifications

• 3+ years' experience in penetration testing.
• 2+ years in client-facing consulting in high-risk environments.
• Strong understanding of OS hardening (Windows/Linux).

Responsibilities

• Evaluate security posture of networks, applications, and devices.
• Perform thoughtful exploitation beyond routine vulnerability scans.
• Collaborate across complex environments with team members.

Skills

Penetration testing

Exploit development

Network architecture

Operating system security

Complex problem solving

Education

Bachelor's degree in computer science or related field

Job description

Critical Infrastructure Penetration Tester

Critical Infrastructure Penetration Tester

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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

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