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LSEG (London Stock Exchange Group)

Senior Security Specialist

LSEG (London Stock Exchange Group)

Senior Security Specialist executing offensive security engagements for LSEG. Leading threat simulations and improving security across products and technology landscape.

Posted 4/17/2026full-timeLondon • 🇬🇧 United KingdomSeniorWebsite

Tech Stack

Tools & technologies
Cyber Security

About the role

Key responsibilities & impact
  • Plan, lead and execute offensive security engagements
  • Employ simulated adversary threat-based approaches
  • Replicate tactics, techniques and procedures used by modern attackers
  • Develop attack plans to meet specified objectives
  • Provide constructive feedback to defenders and product teams
  • Develop, modify and extend tools/exploits
  • Stay current with sophisticated attacks
  • Help defensive teams understand how to detect and/or stop cyber-attacks
  • Report analysis and findings

Requirements

What you’ll need
  • Bachelor's Degree in Information Systems / Technology, Computer Science / Engineering or equivalent field of study or a minimum of 5 years of cyber security experience
  • Demonstrable experience in Red Teaming and Penetration Testing
  • Minimum 3 years of deep, hands-on, technical security experience in multiple security technologies
  • Deep technical understanding of enterprise operating system environments, Active Directory and networking
  • Solid understanding of security vulnerabilities and common software engineering flaws
  • Familiarity with popular scripting languages
  • One or more of the following security certifications OSCP, OSCE, OSEE, OSWE, CREST, GXPEN preferred
  • Strong verbal & written communication skills & presentation skills

Benefits

Comp & perks
  • Healthcare
  • Retirement planning
  • Paid volunteering days
  • Wellbeing initiatives

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools
Red TeamingPenetration Testingscripting languagessecurity vulnerabilitiessoftware engineering flawsenterprise operating systemsActive Directorynetworkingattack planstools/exploits development
Soft Skills
communication skillspresentation skillsconstructive feedback
Certifications
OSCPOSCEOSEEOSWECRESTGXPEN