Senior Security Specialist – Penetration Testing

🕒 July 28

🇬🇧 United Kingdom – Remote

⏰ Full Time

🟠 Senior

👮‍♂️ Cybersecurity / Security Engineer

👻 Ghost score 21%

What it means: how likely this posting is sitting open without active hiring.How to read it: 60% or higher means we think this is a ghost. Lower scores are less of a worry.How we score it: age, reposts, open roles vs team size, how fast jobs close, and whether pay is listed.Fine print: an estimate from public data, not a judgment of the company. Real jobs can score high, so treat it as a hint, not a fact.

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LSEG (London Stock Exchange Group)

WebsiteLinkedInAll Job Openings

10,000+ employees

💸 Finance

💳 Fintech

🤝 B2B

Finance • Fintech • B2B

LSEG (London Stock Exchange Group) is a diversified international markets infrastructure business, earning clients' trust for over 300 years. With a legacy of customer-focused excellence, LSEG provides expertise in capital formation, intellectual property, and risk and balance sheet management. As global leaders in financial indexing and analytic services, they offer unmatched access to international capital markets and high-performance technology solutions that enable companies to access funds for growth. Through their Data & Analytics, Capital Markets, and Post Trade divisions, they deliver a comprehensive suite of trusted financial market infrastructure services.

📋 Description

• Conduct in-depth penetration tests on applications, infrastructure, and cloud environments • Take full ownership of assigned pentesting engagements end-to-end and deliver with limited oversight • Compile technical scoping documents, track and document assessment metadata • Document findings clearly and concisely, providing actionable remediation guidance • Collaborate with application teams to scope, execute, and report on security assessments • Contribute to the continuous improvement of testing methodologies, tooling, automation • Stay current with emerging threats, vulnerabilities, and offensive security techniques • Participate in R&D initiatives as guided from leadership • Support knowledge sharing and mentoring within the team • Develop and maintain custom tools, scripts, and exploits to support testing activities

🎯 Requirements

• Proven hands-on experience in penetration testing of Web Applications, APIs, Thick Client and Common Infrastructures (Active Directory, Cloud and Cloud-native based environments) • Proficiency with tools such as Burp Suite, common command-line tools, and ability to write custom scripts when needed • Experience in automating pentesting tasks • Strong understanding of application security, network protocols, and operating systems • Experience with cloud platforms (AWS, Azure, GCP) and containerized environments (Docker, Kubernetes) • Ability to write clear, technical reports and communicate findings to both technical and non-technical stakeholders • Experience working in large, complex enterprise environments • Fluent communication skills in English, both written and verbal. • Relevant certifications and engagement with the security community is a plus • Threat Modelling experience is a plus

🏖️ Benefits

• Healthcare • Retirement planning • Paid volunteering days • Wellbeing initiatives