Offensive Security Engineer

Company: London Stock Exchange Group
Apply for the Offensive Security Engineer
Location: London
Job Description:

ROLE SUMMARY

This opportunity within the Offensive Security Operations team is a crucial role for the management of vulnerability discovery, offensive testing and remediation activities across the group which protects the business from sophisticated cyber threats.

PROGRAMMES IN SCOPE

  • Regulatory Threat Intelligence Led Pen Testing (TLTP) and Red teaming
  • Bug Bounty
  • Continuous External Attack Surface Management
  • Active Directory security posture management
  • Any programme launched in the future aimed at driving down cyber risk at scale

WHAT YOU’LL BE DOING

  • Collaborate with external vendors, regulators and leadership teams coordinating the timely delivery of requirements
  • Review vulnerability reports, validate issues reported and triage based on risk
  • Support teams in understanding vulnerabilities and validate fixes through retesting
  • Coordinate remediation efforts by detailing actions, owners, timelines and follow up when appropriate
  • Leverage engineering skills to automate and scale security programme objectives

WHAT YOU’LL BRING

  • Technology related Bachelor’s Degree or equivalent experience and certifications in cyber security
  • Background in Red Teaming / Penetration Testing / Bug Bounty advantageous!
  • Experience building AI agentic workflows or deploying and managing security tooling is also advantageous!
  • Understanding of large scale enterprise IT system environments
  • Knowledge of security vulnerabilities and common software engineering flaws and Network Defence analytical models (Kill Chain, ATT&CK, OWASP top 10etc.)
  • Strong verbal & written communication skills & presentation skills
  • Ability to work in a fast‑paced environment as a problem solver and barrier breaker with initiative

CAREER STAGE

Senior Associate

EEO STATEMENT

We are proud to be an equal opportunities employer. This means that we do not discriminate on the basis of anyone’s race, religion, colour, national origin, gender, sexual orientation, gender identity, gender expression, age, marital status, veteran status, pregnancy or disability, or any other basis protected under applicable law.

BENEFITS

LSEG offers a range of tailored benefits and support, including healthcare, retirement planning, paid volunteering days and wellbeing initiatives.

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Posted: May 26th, 2026