Offensive Security Engineer

LSEG; City Of London; On-site; GBP 50,000 - 70,000; Full time

Benefits offered by this job

Healthcare

Retirement planning

Paid volunteering days

Wellbeing initiatives

Job summary

LSEG is seeking a Senior Associate to join their Offensive Security Operations team, focusing on vulnerability discovery and remediation against cyber threats. The role involves coordinating with vendors and managing penetration testing programmes.

Required qualifications include a tech-related degree and knowledge in areas like Penetration Testing and network security. Benefits include healthcare and wellness initiatives.

Qualifications

• Experience in Red Teaming, Penetration Testing or Bug Bounty is advantageous.
• Familiarity with security vulnerabilities and network defence models.
• Strong verbal and written communication skills.

Responsibilities

• Collaborate with external vendors and leadership teams.
• Review and triage vulnerability reports.
• Coordinate remediation efforts and actions.

Skills

Red Teaming

Penetration Testing

Bug Bounty

Communication Skills

Problem Solving

Education

Technology-related Bachelor’s Degree or equivalent experience

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!

The role holder will work with our 3rd‑party vendors to plan and facilitate our testing programmes, ensuring they run efficiently. The programmes in scope include:

• 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 following 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 10, etc.)
• Strong verbal, written communication skills and presentation skills
• Ability to work in a fast‑paced environment as a problem solver and barrier breaker with initiative

Career Stage

Senior Associate

Benefits

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

Equal Opportunity

We are proud to be an equal opportunities employer. We do not discriminate on the basis of 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. Conforming with applicable law, we can reasonably accommodate applicants’ and employees’ religious practices and beliefs, as well as mental health or physical disability needs.