A growing cyber security consultancy is hiring a hands-on penetration tester to take ownership of engagements across web applications, infrastructure, cloud platforms and APIs. You'll run engagements end to end, from scoping through to testing, reporting and client debriefs, working alongside experienced testers. There's funded certification support and scope to move into advanced offensive security areas such as AI security assessments, assumed breach and red teaming.

The Role

This role is suited to someone wanting to broaden their technical range and own engagements outright, with prior hands-on experience in penetration testing

• Test across a variety of environments, including web applications, infrastructure, cloud platforms and APIs.
• Help clients identify vulnerabilities, understand their security risks and implement effective remediation.
• Work alongside experienced security professionals and contribute to testing methodologies and tooling.
• Develop expertise in more advanced areas of offensive security.

What You'll Be Doing

• Deliver penetration testing engagements across web applications, infrastructure, cloud environments and APIs.
• Manage engagements from initial scoping through to testing, reporting and client debriefs.
• Identify, investigate and validate vulnerabilities, providing clear technical findings and practical remediation advice.
• Produce accurate, high-quality reports tailored to both technical and non-technical audiences.
• Communicate findings and recommendations directly to clients.
• Contribute to the development of testing methodologies, processes and internal tooling.
• Work collaboratively with experienced testers to maintain and improve the quality of security assessments.
• Build expertise in emerging areas, including AI security assessments, assumed breach exercises and red-team operations.

What We're Looking For

• Commercial experience delivering penetration testing engagements.
• Hands-on experience testing web applications and infrastructure, with exposure to cloud environments and APIs.
• Strong technical understanding of common vulnerabilities, exploitation techniques and security testing methodologies.
• Experience producing technical reports and communicating findings to clients.
• Ability to manage testing activities independently and take ownership of engagements.
• A proactive approach to learning, problem-solving and developing technical capabilities.
• Strong written and verbal communication skills.

Nice to Have

• Relevant industry certifications, such as CREST qualifications.

Benefits

• Salary of £60,000 - £65,000, depending on experience.
• Hybrid working, with two days per week in a central London office.
• Exposure to a diverse range of penetration testing engagements and client environments.
• Support for professional development, including funded certifications and conference attendance.
• A structured personal development plan and opportunities to expand into advanced offensive security disciplines.
• The chance to work alongside experienced security professionals within a growing consultancy.

Location & Working Pattern

• Hybrid working based around a central London office, two days per week on site.
• Candidates must have the existing right to work in the UK.
• Candidates must be able to commute into central London twice per week.

Oscar Associates (UK) Limited is acting as an Employment Agency in relation to this vacancy.

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