Senior Application Security Engineer Stock Exchange Group

Job Description

ABOUT US: LSEG (London Stock Exchange Group) is more than a diversified global financial markets infrastructure and data business. We are dedicated, open-access partners with a dedication to excellence in delivering the services our customers expect from us. With extensive experience, deep knowledge and worldwide presence across financial markets, we enable businesses and economies around the world to fund innovation, manage risk and create jobs.

It's how we've contributed to supporting the financial stability and growth of communities and economies globally for more than 300 years. Through a comprehensive suite of trusted financial market infrastructure services - and our open-access model - we provide the flexibility, stability and trust that enable our customers to pursue their ambitions with confidence and clarity.

LSEG is headquartered in the United Kingdom, with significant operations in 65 countries across EMEA, North America, Latin America and Asia Pacific. We employ 25,000 people globally, more than half located in Asia Pacific. LSEG's ticker symbol is LSEG.

OUR PEOPLE: People are at the heart of what we do and drive the success of our business. Our values of Integrity, Partnership, Excellence and Change shape how we think, how we do things and how we help our people fulfil their potential. We embrace diversity and actively seek to attract individuals with unique backgrounds and perspectives. We break down barriers and encourage teamwork, enabling innovation and rapid development of solutions that make a difference.

Our workplace generates an enriching and rewarding experience for our people and customers alike. Our vision is to build an inclusive culture in which everyone feels encouraged to fulfil their potential.

We know that real personal growth cannot be achieved by simply climbing a career ladder - which is why we encourage and enable a wealth of avenues and interesting opportunities for everyone to broaden and deepen their skills and expertise. As a global organisation spanning 65 countries and one rooted in a culture of growth, opportunity, diversity and innovation, LSEG is a place where everyone can grow, develop and fulfil your potential with meaningful careers.

Role profile: Enable the Group to operate and expand an Application Security Programme and reduce application-level vulnerabilities.

ROLE

SUMMARY:

The role focuses on driving the implementation and growth of the Application Security Programme to reduce vulnerabilities across applications. It involves partnering with product teams to integrate security practices into development workflows, analysing scan results, and guiding effective remediation strategies. Success in this position requires strong collaboration, technical expertise in security tools, and the ability to communicate technical information clearly to diverse stakeholders.

WHAT YOU'LL BE DOING:

• Collaborating across teams to tackle vulnerabilities head‑on and design effective, practical mitigation strategies.
• Leading security excellence by engaging with stakeholders to strengthen and continuously improve the organization’s application security posture.
• Turning insights into action by analysing security scan results, validating findings, eliminating false positives, and guiding informed remediation decisions.
• Driving alignment and innovation by sharing knowledge, setting clear objectives, and delivering impactful application security outcomes.
• Empowering product teams by seamlessly integrating Application Security solutions into their development workflows.

WHAT YOU'LL BRING:

Technical Foundation

• A strong understanding of common and emerging vulnerabilities across web applications, APIs, and other platforms, along with knowledge of key security standards such as OWASP Top 10, SANS Top 25, NIST, and ASVS.
• Hands‑on experience with security tools like SAST, SCA, and container scanning, plus familiarity with programming languages such as Java, C#, and Python.
• Knowledge of modern development practices, including Agile, Dev Ops, and Sec Dev Ops , enabling you to work effectively in fast‑paced environments.

Vulnerability Management

• Proven experience managing…