Senior Penetration Tester — Offensive Security Lead

London Stock Exchange Group; Greater London; Remote; GBP 80,000 - 120,000; Full time

Benefits offered by this job

Healthcare

Retirement planning

Paid volunteering days

Wellbeing initiatives

Job summary

London Stock Exchange Group (LSEG) seeks a Senior Penetration Tester to join our internal offensive security team. This hands-on, highly technical role plans and executes penetration tests across systems and applications, uncovering vulnerabilities and raising security standards.

You will own engagements end-to-end, write technical reports, and collaborate with engineering teams to remediate findings. Experience with cloud, containers, and enterprise environments is essential; strong English

Qualifications

• Hands-on pentesting of web apps, APIs, thick clients, and infra.

Responsibilities

• Conduct in-depth penetration tests on applications, infrastructure, and cloud environments.
• Own assigned pentesting engagements end-to-end with limited oversight.
• Document findings clearly and provide actionable remediation guidance.
• Collaborate with application teams to scope, execute, and report security assessments.

Skills

Penetration testing

Burp Suite

Scripting

Automation

Cloud platforms

Docker

Kubernetes

Technical reporting

English communication

Tools

Burp Suite

Job description

London Stock Exchange Group (LSEG) seeks a Senior Penetration Tester to join our internal offensive security team. This hands-on, highly technical role plans and executes penetration tests across systems and applications, uncovering vulnerabilities and raising security standards.

You will own engagements end-to-end, write technical reports, and collaborate with engineering teams to remediate findings. Experience with cloud, containers, and enterprise environments is essential; strong English