Senior React Engineer

Role profile:Regulatory Reporting Solutions (RRS) is the London Stock Exchange's regulatory reporting, matching and reconciliation solution provider. RRS customers include investment banks, hedge funds, brokers and other financial services firms. Post Trade Regulatory Reporting provides business solutions in the areas of:Regulatory reporting with MiFIR, EMIR, UKMIIR, G20 and other regimes Provision of reference data (especially financial instruments data) Analytics and Surveillance platforms that provides a suite of control frameworks These services have seen year on year growth and are underpinned with a fully cloud hosted applications suite. To continue with these successes and increase market share we are looking to modernise and enhance these applications by delivering an enhanced new UI, API development alongside new scalable functionality to meet evolving market demands.ROLE SUMMARY:RRS is seeking an experienced and strategic Senior React Engineer to drive the design, development, and implementation of dynamic web applications using React.js. The Platform Engineering team develops, maintains and enhances the core RRS platform that backs multiple regulated Tier 1 applications and solutions. A new greenfield project is being initiated to deliver the NextGen platform for RRS.The successful candidate will lead the front-end development of high-performance, secure, and scalable financial platforms. As a core member of the development team, you will build intuitive and responsive user interfaces for applications that handle sensitive financial data, real-time analytics, and complex user workflowsThe role requires collaboration with cross-functional teams to deliver scalable, high-performance front-end solutions. This position is ideal for someone who thrives in a fast-paced environment and has a deep understanding of JavaScript, component-driven architecture, and modern front-end best practices.This opening requires a candidate who takes great pride in delivering excellence with excellent logical and technical skills and a can-do attitude combined with a helpful mentality, and a wish to play a critical role in forming and tacking an established platform on its next technology journey.The culture of the RRS team is dynamic, and requires each individual to adapt rapidly to change, contribute fully and think on their feetWHAT YOU'LL BE DOING:Key ResponsibilitiesDesign, develop, and maintain complex React applications with a focus on performance, scalability, and maintainability. Write clean, modular, and reusable code using modern JavaScript (ES6+). Collaborate with UI/UX designers, backend developers, and product managers to deliver exceptional user experiences. Architect front-end solutions using tools such as Redux, Context API, or other state management libraries. Optimize applications for maximum speed and scalability. Conduct code reviews, mentor junior developers, and promote best coding practices. Troubleshoot and debug performance issues and bugs in a timely manner. Stay up to date with emerging front-end technologies and propose improvements to processes and tools. Candidate Profile / Key Skills5+ years of experience in front-end development, with at least 3 years in React.js. Proficient in HTML5, CSS3, JavaScript (ES6+), and TypeScript. Strong experience with state management libraries (Redux, MobX, Zustand, etc.). Deep understanding of software architecture, design patterns, microservices, and distributed systems Solid understanding of RESTful APIs, WebSockets, and modern front-end build pipelines. Experience with RESTful API design and cloud platforms (AWS or Azure). Familiarity with testing tools such as Jest, React Testing Library, or Cypress. Familiarity with DevOps practices and tools (CI/CD pipelines, Docker, Kubernetes). Deployment of web applications and experience with continuous integration tools e.g GitLab and familiar with build and dependency management systems e.g. Maven Good awareness of the design, development and SDLC considerations required for development of Financial Services market infrastructure applications Builds strong relationships with their team and colleagues, collaborating closely with team Takes interest to develop knowledge in technology products and tools through on the job learning, certifications and projects. Collaborate closely with QA teams Providing L3 support for critical production issue. Desirable skills and experience:Experience with Cloud Native technologies on at least one of the major cloud services providers (Azure or AWS) Snowflake Rest API design and development Kubernetes / microservices applications design Behavioural SkillsEmpower the staff to be accountable and responsible for their own actions and decisions. Proven experience in team building, mentorship, and performance management. Strong communication and collaboration skills across technical and non-technical teams. Handles own workload and promotes an open and inclusive culture Builds strong relationships with their team and colleagues, collaborating closely with team Career Stage:ManagerLondon 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.