Senior Penetration Tester

Senior Penetration Tester – UK remote - £60,000 - £80,000

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
• Support scoping, pre-engagement, and post-engagement activities
• Stay sharp: engage in continuous learning and threat landscape analysis

About You

• Proven experience inpenetration testing and red teaming(internal, external, app, cloud, etc.)
• Strong understanding of attacker TTPs and detection evasion
• Familiarity with frameworks such asOWASP,MITRE ATT&CK, andNIST
• Experience withC2 frameworks(e.g., Cobalt Strike, PoshC2, Sliver)
• Certifications such asOSCP, CRTO, OSEP, or CREST CRTpreferred (but not required)