Senior Penetration Tester

JR United Kingdom; Hounslow; On-site; GBP 70,000 - 100,000; Full time

Job summary

A prestigious cyber consultancy is seeking an experienced Senior Penetration Tester based in South West London. The role involves leading high-impact penetration tests and red team engagements, suited for those thriving in challenging technical environments. Ideal candidates possess a strong foundation in penetration testing, familiarity with industry frameworks, and a passion for offensive security.

Qualifications

• Proven experience in penetration testing and red teaming across various environments.
• Strong understanding of attacker TTPs and detection evasion techniques.
• Familiarity with frameworks like OWASP and MITRE ATT&CK.

Responsibilities

• Lead and execute complex penetration tests and adversary simulations.
• Deliver red team engagements aligned with frameworks like TIBER and MITRE ATT&CK.
• Mentor junior testers and contribute to internal R&D.

Skills

Penetration Testing

Red Teaming

Technical Reporting

Threat Landscape Analysis

Education

Certifications such as OSCP, CRTO, OSEP, or CREST CRT

Tools

Cobalt Strike

PoshC2

Sliver

Job description

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Senior Penetration Tester, south west london

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Client:

Opus Recruitment Solutions

Location:

south west london, United Kingdom

Job Category:

Other

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EU work permit required:

Yes

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Job Views:

2

Posted:

24.06.2025

Expiry Date:

08.08.2025

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Job Description:

Opus is seeking an experienced Penetration Tester to join our client, a cyber consultancy specializing exclusively in penetration testing and red teaming. The role involves delivering high-impact, adversary-simulated engagements across infrastructure, web, cloud, and bespoke environments, including leading goal-based assessments and full-scale red team operations.

This client-facing, hands-on position is ideal for someone who thrives in technically demanding scenarios and prefers working with a small, elite team of offensive security specialists.

Key Responsibilities

• Lead and execute complex penetration tests and adversary simulations
• Deliver red team engagements aligned with frameworks like TIBER, CBEST, and MITRE ATT&CK
• Develop custom tooling and exploits as needed
• Create detailed technical and executive reports for clients
• Mentor junior testers and contribute to internal R&D
• Engage in continuous learning and threat landscape analysis

About You

• Proven experience in penetration testing and red teaming (internal, external, application, cloud, etc.)
• Strong understanding of attacker TTPs and detection evasion techniques
• Familiarity with frameworks such as OWASP, MITRE ATT&CK, and NIST
• Experience with C2 frameworks like Cobalt Strike, PoshC2, or Sliver
• Certifications such as OSCP, CRTO, OSEP, or CREST CRT are preferred but not mandatory