Senior Penetration Tester & Adversarial Security Engineer

FSP; Glasgow; Hybrid; GBP 45,000 - 65,000; Full time

Job summary

FSP is seeking a capable penetration tester in the United Kingdom to support high-impact security projects for diverse customers. You will assess security across web, network, and infrastructure layers, triage findings, and contribute to vulnerability research and tooling development.

The role requires at least 2 years in pentesting or vulnerability research, strong coding skills (C/C++, C#, Java, Python), and the ability to script and build custom tools.

Qualifications

• At least 2 years direct experience in penetration testing or vulnerability research.
• Skilled in programming languages (C/C++, C#, Java, Python).
• Experienced in scripting to develop custom scripts, exploits, and tools.
• Strong knowledge of both web application and infrastructure testing.

Responsibilities

• Support your team to deliver high impact technical projects to customers.
• Provide technical advice on security technologies including network, platform, and application security.
• Analyse, triage, report and prioritise findings to internal teams, customers, vendors and security teams.
• Design, develop and maintain tools and techniques for adversarial simulation, vulnerability research, and exploit development.
• Contribute to the development of internal and external cybersecurity strategy, policy, standards, and frameworks.

Skills

C/C++

C#

Java

Python

Job description

FSP is seeking a capable penetration tester in the United Kingdom to support high-impact security projects for diverse customers. You will assess security across web, network, and infrastructure layers, triage findings, and contribute to vulnerability research and tooling development.

The role requires at least 2 years in pentesting or vulnerability research, strong coding skills (C/C++, C#, Java, Python), and the ability to script and build custom tools.