Senior Penetration Tester - Systems Integrator

Hamilton Barnes Associates Limited; Greater London; Hybrid; GBP 70,000 - 90,000; Full time

Job summary

A leading technology company based in London is seeking an experienced penetration tester. The role entails leading penetration testing efforts, developing test plans, and producing impact reports. The ideal candidate has over 5 years of experience in penetration testing with an emphasis on threat intelligence. This position offers a hybrid work model and competitive salary up to £90,000 per annum.

Benefits

High-impact role

Collaborative team environment

Qualifications

• 5+ years of professional experience in penetration testing.
• Strong understanding of OT/IT systems and common vulnerabilities.
• Must hold or be eligible for SC Clearance.

Responsibilities

• Lead full-scope, threat intelligence-led penetration testing.
• Develop test plans based on emerging threats.
• Produce detailed reports with technical findings.

Skills

Penetration testing

Threat intelligence

Adversary emulation

Communication

Vulnerability management

Tools

Breach Attack Simulation tools

ISO 27001

Cloud security (AWS, Azure, GCP)

Job description

Are you looking for an exciting new opportunity? Join a global leader in information and communication technology, recognised for their expertise in private networks, cloud, hosting, IP networking services, and pioneering work in IPv6 transit technology. With operations spanning 14 countries across the Asia Pacific region, this organisation supports over 5,000 clients and employs more than 54,000 professionals. They also operate 16 advanced data centres in eight countries, providing cutting-edge solutions that power digital transformation and connectivity across the region.

If you would like to learn more about this opportunity, feel free to reach out and apply today!

Responsibilities:

• Lead full-scope, threat intelligence-led penetration testing across applications, infrastructure, cloud (AWS, Azure), APIs, OT/ICS, and O365.
• Develop sophisticated test plans and use cases based on emerging threats and attacker TTPs.
• Produce detailed, high-impact reports with clear technical findings and business-aligned remediation advice.
• Work closely with client cybersecurity teams to prioritize and track vulnerability remediation, contributing to blue team effectiveness.
• Conduct ongoing research and contribute to thought leadership in threat-informed testing methodologies.

Required Skills:

• 5+ years of professional experience in penetration testing, with a strong emphasis on threat intel and adversary emulation.
• Deep understanding of OT/IT systems, common vulnerabilities, network protocols, cryptography, and attack vectors.
• Proficiency in tools and frameworks used in both offensive security and threat intelligence.
• Proven ability to scope, manage, and deliver complex engagements with excellent communication across technical and non-technical stakeholders.
• CREST CRT / CHECK (or higher) certification is essential.
• Must hold or be eligible for SC Clearance.

Desirable Skills:

• Experience with Breach Attack Simulation tools and vulnerability management processes.
• Familiarity with ISO 27001, risk management frameworks, and compliance-oriented testing.
• Hands-on knowledge of cloud security in AWS, Azure, or GCP.
• Advanced cybersecurity certifications such as CISM, CISSP, CREST CCT, or ECSA.

Location:

• London-Based
• Hybrid/Remote Options Available

Benefits:

• Work in a high-impact role where your expertise directly influences the resilience of major organisations.
• Join a collaborative, technically elite team focused on cutting-edge offensive techniques and driving genuine security improvements.

Salary:

• Up to £90,000 Per Annum (Basic)