Principal AI 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 70 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 culture of connecting, creating opportunity and delivering excellence 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 70 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 SUMMARY:

The Principal Engineer is a senior technical expert responsible for designing, developing, and delivering high-quality software solutions.

This role emphasizes deep technical proficiency, innovation, and hands-on development, including advanced work in AI technologies such as prompt engineering and large language models (LLMs).

The ideal candidate will serve as a technical authority, proving concepts with the latest AI technology or practices in the form of a spike or proof of concept. 

This person will be responsible for pushing the boundaries of what is possible, turning vision or concept into a technical solution, driving best practices and ensuring scalability, performance, and security across systems.

WHAT YOU'LL BE DOING:

Software Development

• Design and implement complex, scalable, and secure applications.

• Write clean, efficient, and maintainable code in Java, Python, and other high-level languages.

Technical Expertise

• Provide architectural guidance and ensure adherence to best practices.

• Optimize system performance and troubleshoot critical issues.

AI Development

• Develop and refine prompt engineering strategies for LLM-based applications.

• Integrate and optimize Large Language Models (LLMs) into products and workflows.

• Collaborate with AI teams to improve model performance and user experience.

Innovation & Research

• Stay current with emerging technologies, frameworks, and AI advancements.

• Prototype and evaluate new tools and methodologies for adoption.

• Collaboration

• Work closely with product managers, QA, and other developers to deliver high-quality solutions.

• Participate in code reviews and contribute to technical documentation.

Process & Quality

• Advocate for automation, testing, and continuous integration practices.

• Ensure compliance with security and regulatory standards.

WHAT YOU'LL BRING:

• 12+ years in software development, with a least a year in AI Development.

• Extensive experience in software development and system architecture.

• Proven ability to deliver complex projects with high technical standards.

• Strong technical background in Java, Python, and/or other high-level programming languages.

• Expertise in designing scalable and secure systems.

• Hands-on experience with AI tools and frameworks, including:

  • Prompt Engineering for LLMs (e.g., OpenAI GPT, Anthropic Claude).

  • Model fine-tuning and deployment.

  • AI integration into enterprise applications.

  • Prompt management tools (Langfuse)

  • Knowledge of vector databases, embeddings, and retrieval-augmented generation (RAG).

• Experience with cloud platforms (AWS, Azure, GCP).

• Familiarity with CI/CD pipelines and modern development tools.

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.

If you are submitting as a Recruitment Agency Partner, it is essential and your responsibility to ensure that candidates applying to LSEG are aware of this privacy notice.