Big Red Recruitment
Penetration Tester
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We are seeking a Penetration Tester to join a growing Offensive Security team within a specialist cyber security consultancy. This is an exciting opportunity to join at a time of significant investment and growth, helping to strengthen existing testing services while contributing to the development of new capabilities across areas such as Red Teaming, Operational Technology (OT), Threat-Led Security Testing and emerging technologies.
The successful candidate will play a key role in delivering penetration testing engagements, supporting process improvement initiatives, and helping to build a scalable and mature testing function. This position offers excellent opportunities for professional development, certification support and future progression into senior or leadership positions.
Job Role - Penetration Tester
Location: London (Occasional on-site work)
Salary: £40,000-£45,000 + Benefits
Key Responsibilities
- Conduct vulnerability assessments and penetration testing engagements across:
- Internal infrastructure
- External infrastructure
- Web applications
- Networks and systems
- Perform configuration and build reviews using recognised security frameworks and benchmarks.
- Produce clear, concise and actionable technical reports detailing findings, risk ratings and remediation recommendations.
- Utilise industry-standard security testing tools including Burp Suite, Nessus, Metasploit, Nmap, Wireshark and related technologies.
- Work directly with clients and stakeholders, presenting findings and providing remediation guidance where required.
- Support the continuous improvement of testing methodologies, processes and documentation.
- Assist in creating and maintaining standard operating procedures, testing guides and knowledge-sharing materials.
- Collaborate with wider cyber security teams to support service development and research initiatives.
- Contribute to research and development activities across new security testing disciplines and technologies.
- Participate in occasional out-of-hours and on-site engagements where client requirements dictate.
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Required Skills & Experience
- Minimum 2–3 years' experience in penetration testing, vulnerability assessment or offensive security.
- Experience conducting:
- Internal and external infrastructure testing
- Web application security testing
- Security assessments and audits
- Vulnerability identification and validation
- Strong understanding of networking concepts, protocols, routing and firewall technologies.
- Experience working with Windows, Linux and macOS environments.
- Familiarity with security assessment tools such as:
- Burp Suite
- Nessus
- Metasploit
- Nmap
- Wireshark
- Experience producing high-quality technical reports and client-facing documentation.
- Excellent communication and stakeholder management skills.
- Strong organisational skills and ability to manage workload independently.
- Comfortable working in a consultancy or client-facing environment.
- Eligible to obtain UK Security Clearance.
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Desirable Skills & Certifications
- CREST CRT, CPSA, CCT or equivalent certification.
- OSCP or similar offensive security qualification.
- Cyber Scheme accreditation.
- CHECK Team Member status.
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