Penetration Tester

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.

Required Skills & Experience

• Minimum 2 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.

Desirable Skills & Certifications

• CREST CRT, CPSA, CCT or equivalent certification.

• OSCP or similar offensive security qualification.

• Cyber Scheme accreditation.

• CHECK Team Member status.