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 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)