Job Title

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 ResponsibilitiesLead and execute complex penetration tests and adversary simulationsDeliver red team engagements aligned with frameworks like TIBER, CBEST, and MITRE ATT&CKDevelop custom tooling and exploits where requiredCreate detailed, client-facing technical and executive reportsMentor junior testers and contribute to internal R&DSupport scoping, pre-engagement, and post-engagement activitiesStay sharp: engage in continuous learning and threat landscape analysisAbout YouProven experience in penetration testing and red teaming (internal, external, app, cloud, etc.)Strong understanding of attacker TTPs and detection evasionFamiliarity with frameworks such as OWASP, MITRE ATT&CK, and NISTExperience with C2 frameworks (e.g., Cobalt Strike, PoshC2, Sliver)Certifications such as OSCP, CRTO, OSEP, or CREST CRT preferred (but not required)