Senior Application Security Engineer

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.

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, DevOps, and SecDevOps, enabling you to work effectively in fast-paced environments.

Vulnerability Management

• Proven experience managing remediation activities within application security and the ability to clearly explain the rationale behind security fixes to ensure understanding and impact.

• Strong analytical skills to interpret and correlate data from sources like SAST, SCA, and penetration tests, identifying trends and prioritizing remediation efforts.

• The capability to link issues across multiple layers—code, infrastructure, identity, cloud environments, and third-party services—and propose process improvements to reduce systemic vulnerabilities and recurring risks.

Collaboration & Communication

Ability to work effectively with technical and business teams, manage expectations, and deliver clear, actionable insights to stakeholders at all levels. Adept at handling complex situations with integrity and clarity.

Desirable – Automation Experience

Hands-on experience implementing automated security testing at scale (SAST, SCA, containers) and troubleshooting integration issues between security tools and development environments.

WHAT YOU'LL GET IN RETURN:

• Work with some of the most talented minds in the industry, collaborating on impactful security initiatives that make a real difference globally.

• Be part of an industry that brings immense value to customers worldwide and is highly respected, giving you the chance to contribute to meaningful outcomes.

• Create and innovate as an engineer, building new solutions and shaping the future of application security.

• Join a fun and innovative company that encourages creativity and fresh ideas.

• Expand your skill set by learning new tools, techniques, and approaches in a dynamic environment.

• Enjoy a positive, balanced work culture that prioritizes well-being and fosters a happy, collaborative atmosphere.

Career Stage:

London Stock Exchange Group (LSEG) Information:

Join us and be part of a team that values innovation, quality, and continuous improvement. If you're ready to take your career to the next level and make a significant impact, we'd love to hear from you.

LSEG is a leading global financial markets infrastructure and data provider. Our purpose is driving financial stability, empowering economies and enabling customers to create sustainable growth.

Our purpose is the foundation on which our culture is built. Our values of Integrity, Partnership, Excellence and Change underpin our purpose and set the standard for everything we do, every day. They go to the heart of who we are and guide our decision making and everyday actions.

Working with us means that you will be part of a dynamic organisation of 25,000 people across 65 countries. However, we will value your individuality and enable you to bring your true self to work so you can help enrich our diverse workforce.

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. Conforming with applicable law, we can reasonably accommodate applicants' and employees' religious practices and beliefs, as well as mental health or physical disability needs.

You will be part of a collaborative and creative culture where we encourage new ideas. We are committed to sustainability across our global business and we are proud to partner with our customers to help them meet their sustainability objectives. Our charity, the LSEG Foundation provides charitable grants to community groups that help people access economic opportunities and build a secure future with financial independence. Colleagues can get involved through fundraising and volunteering.

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

Please take a moment to read this privacy notice carefully, as it describes what personal information London Stock Exchange Group (LSEG) (we) may hold about you, what it's used for, and how it's obtained, your rights and how to contact us as a data subject.

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