Principal Web Architect – LSEG

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ABOUT US

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

OUR PEOPLE

People are at the heart of what we do and drive our success. Our culture of connecting, creating opportunity and delivering excellence shapes how we think, act and help our people fulfil their potential. We embrace diversity, encourage teamwork and foster an inclusive environment where everyone feels encouraged to reach their potential.

ROLE SUMMARY

Reporting to the Director of Architecture within the Risk Intelligence team, you will lead the evolution of our web platforms in a high‑impact role that shapes technical direction, mentors senior engineers and ensures our tooling and frameworks remain world‑class.

Main Responsibilities

• Architectural Leadership: Define and evolve the architecture of our web platforms to ensure scalability, performance and maintainability.
• Code Quality & Reviews: Conduct code reviews, establish best practices and ensure adherence to architectural and coding standards.
• Mentorship & Coaching: Guide and mentor senior engineers, fostering a culture of technical excellence and continuous learning.
• Tooling & Developer Experience: Own and enhance the tooling ecosystem (CI/CD, linters, bundlers, testing frameworks) to streamline development workflows.
• Framework Development: Contribute to and maintain shared frameworks and libraries that power our web applications.
• Innovation & Research: Stay ahead of emerging trends in web technologies (e.g., edge computing, WebAssembly, server components) and assess their relevance to our stack.
• Cross‑functional Collaboration: Work closely with product, design and backend teams to deliver cohesive and performant user experiences.

Skills / Experience Required

• Proven experience in architecting and developing web applications.
• Deep expertise in modern JavaScript/TypeScript, React (or similar frameworks) and web performance optimization.
• Strong understanding of software design patterns, SOLID principles, unit testing and dependency injection.
• Solid knowledge of frontend infrastructure, build systems and deployment pipelines.
• Experience coaching senior engineers and leading technical initiatives.
• Passion for developer experience and tooling.
• Ability to balance hands‑on coding with strategic architectural thinking.
• Strong communication skills to convey complex ideas clearly to technical and non‑technical audiences.

Bonus Skills / Experience

• Experience with micro frontends, design systems or federated architectures.
• Familiarity with backend‑for‑frontend patterns and GraphQL.
• Contributions to open‑source projects or technical blogs.

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 to drive financial stability, empower economies and enable customers to create sustainable growth. Our values of Integrity, Partnership, Excellence and Change underpin our purpose and guide everything we do.

Our purpose is the foundation of our culture. We believe in diversity and inclusion and empower individuals to bring their true selves to work, enriching our workforce.

We are proud to be an equal‑opportunities employer. We do not discriminate on any protected basis. We are committed to accommodating religious practices, mental health or physical disability needs as required under applicable law.

We are also committed to sustainability and support our customers to meet their objectives. LSEG offers a range of tailored benefits and support, including healthcare, retirement planning, paid volunteering days and wellbeing initiatives.

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