Senior Penetration Tester

JR United Kingdom; Peterborough; On-site; GBP 60,000 - 90,000; Full time

Job summary

Une consultation de cybersécurité de premier plan recherche un Senior Penetration Tester pour se joindre à leur équipe experte. Ce rôle client est axé sur la direction de tests complexes et la simulation d'adversaires, ainsi que sur le mentorat de testeurs juniors. Idéal pour ceux qui aiment relever des défis techniques et veulent évoluer dans un environnement dynamique.

Qualifications

• Expérience prouvée en tests de pénétration et red teaming.
• Compréhension forte des TTPs des attaquants et d'évasion de détection.
• Familiarité avec des frameworks tels que OWASP, MITRE ATT&CK et NIST.

Responsibilities

• Diriger et exécuter des tests de pénétration complexes et des simulations d'adversaires.
• Livrer des engagements de red team alignés sur les frameworks TIBER, CBEST et MITRE ATT&CK.
• Développer des outils personnalisés et des exploits si nécessaire.

Skills

Penetration testing

Red teaming

Continuous learning

Threat landscape analysis

Technical reporting

Education

Certifications like OSCP, CRTO, OSEP, or CREST CRT

Tools

C2 frameworks (Cobalt Strike, PoshC2, Sliver)

OWASP

MITRE ATT&CK

NIST

Job description

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Opus are looking for an experienced Penetration Tester to join our client, a cyber consultancy specialising exclusively in penetration testing and red teaming, delivering high-impact, adversary-simulated engagements for clients ranging from agile tech scale-ups to critical infrastructure providers. As a Senior Penetration Tester, you’ll play a central role in executing and shaping these engagements—across infrastructure, web, cloud, and bespoke environments—while also leading goal-based assessments and full-scale red team operations.

This is a hands-on, client-facing position suited to someone who thrives in technically demanding scenarios and wants to work alongside 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 where required
• Create detailed, client-facing technical and executive reports
• Mentor junior testers and contribute to internal R&D
• Stay sharp: engage in continuous learning and threat landscape analysis

About You

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