Penetration Tester (Infrastructure)

Anson McCade; London; On-site; GBP 45,000 - 60,000; Full time

Job summary

A highly regarded digital security team is seeking an experienced Infrastructure Penetration Tester to join their collaborative efforts in assessing complex client environments. The ideal candidate should possess a strong background in penetration testing and thrive in technical challenges, delivering impactful results through hands-on work.

Qualifications

• At least 4 years’ experience in infrastructure penetration testing.
• Strong command over Windows and Linux systems.
• Ability to navigate legacy systems and environments with technical debt.

Responsibilities

• Conduct internal infrastructure and Active Directory penetration tests.
• Produce detailed reports for technical and non-technical audiences.
• Maintain and build client relationships in a consultancy capacity.

Skills

Active Directory exploitation techniques

Command-line skills

Python scripting

Operational Technology networks

Education

CREST CTM, CTL, CSTM or Cyber Scheme Practitioner

OSCP (current or lapsed)

Tools

Internal infrastructure exploitation tools

Job description

This range is provided by Anson McCade. Your actual pay will be based on your skills and experience — talk with your recruiter to learn more.

Base pay range

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Note: To be eligible for this role, you must be eligible for UK Security Clearance (SC).

A high-performing digital security team is looking for an experienced Infrastructure Penetration Tester to join them in delivering critical assessments across complex and sensitive client environments.

This is a hands-on internal testing role, not web application focused, where you'll be expected to work independently and navigate challenging systems with confidence.

This role is suited to testers who thrive in technically demanding scenarios, want autonomy, and are motivated by work with real-world impact.

Key Responsibilities

• Conduct internal infrastructure and Active Directory penetration tests in live production environments
• Produce clear, concise reports tailored to both technical and non-technical audiences
• Build trusted relationships with clients in a consultancy-facing capacity
• Work within a small, high-trust team on sensitive engagements
• Contribute to the evolution of internal tooling and testing methodologies
• Operate effectively in environments with limited documentation or predefined processes

Essential Experience and Skills

• At least 4 years’ experience in infrastructure penetration testing
• Strong knowledge of Active Directory exploitation techniques (privilege escalation, lateral movement, etc.)
• Strong command-line skills across Windows and Linux systems
• Ability to work through legacy systems, unpatched software, and environments with technical debt
• Python scripting or automation experience
• Understanding of Operational Technology (OT) networks
• Familiarity with internal infrastructure exploitation tools

Certifications (preferred but not essential):

• CREST CTM, CTL, CSTM or Cyber Scheme Practitioner
• OSCP (current or lapsed)

If you’re an experienced infrastructure penetration tester looking for meaningful work, we want to hear from you.

Seniority level

• Seniority level

  Mid-Senior level

Employment type

• Employment type

  Full-time

Job function

• Job function

  Consulting

• Industries

  Software Development and Computer and Network Security

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