Penetration Tester & AI Security Engineer — London

Javelin Global Commodities; City of Westminster; On-site; GBP 70,000 - 120,000; Full time

Benefits offered by this job

Annual discretionary bonus

25 days holiday

Company pension scheme (10% company)

Private medical scheme

Travel insurance

Income protection

Life insurance (5x salary)

Bike2Work scheme

Season ticket loan

Onsite gym

Job summary

Javelin Global Commodities in London seeks a Penetration Tester & AI Security Engineer to join the Infrastructure team. You will identify vulnerabilities across infrastructure, applications and AI-enabled solutions, and work with cross-functional teams to remediate and strengthen security controls.

The role combines traditional penetration testing with AI security testing, secure AI development and client-facing security assessments. Full-time, based in the London office near Victoria.

Qualifications

• Proven experience in penetration testing across infrastructure, web apps, APIs and cloud.
• Strong knowledge of AD, Entra ID, M365, Azure and AWS.
• Experience with security tools and secure development principles.
• Understanding of AI security, prompt-injection testing and AI red teaming.

Responsibilities

• Conduct penetration testing across infrastructure, apps, networks and cloud environments.
• Identify vulnerabilities and work with teams to remediate and retest.
• Perform authorised security testing of new client platforms and integrations.
• Support secure development of in-house AI solutions and AI agents.
• Ensure AI solutions follow security, privacy and access-control requirements.
• Test AI security controls including prompt injection and data leakage.
• Produce clear findings and actionable remediation recommendations.

Skills

Penetration testing

Security engineering

AI security

Cloud environments

Active Directory

PowerShell/Python

Tools

Burp Suite

OAuth/OIDC

REST APIs

Copilot Studio/Azure AI

Azure/AWS

Microsoft Entra ID

Microsoft 365

Job description

Javelin Global Commodities in London seeks a Penetration Tester & AI Security Engineer to join the Infrastructure team. You will identify vulnerabilities across infrastructure, applications and AI-enabled solutions, and work with cross-functional teams to remediate and strengthen security controls.

The role combines traditional penetration testing with AI security testing, secure AI development and client-facing security assessments. Full-time, based in the London office near Victoria.