Web Developer jobs in United Kingdom

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:**Reporting to the Director of Architecture within the Risk Intelligence team. Risk Intelligence is responsible for developing critical services that support anti-money laundering efforts in the financial markets. We’re looking for an ambitious Principal Web Architect to lead the evolution of our web platforms. This is a high-impact role where you’ll shape the technical direction of our web stack, mentor senior engineers, and ensure our tooling and frameworks are world-class. You’ll be instrumental in driving web innovation, ensuring code quality, and staying ahead of the curve in modern web development. **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.* Deep understanding of software design patterns, SOLID, unit testing, locking, dependency injection and other essential engineering methods.* Strong understanding 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.* Ability to lead by example, influencing without direct authority, and communicate 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 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 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, .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.LSEG (London Stock Exchange Group) 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 culture of connecting, creating opportunity and delivering excellence shapes how we think, how we do things and how we help our people fulfil their potential.