Senior UI Developer (React)

Job Summary

We are seeking a skilled and hard-working UI Developer to join our front-end engineering team. The ideal candidate will have solid experience building scalable, performant, and maintainable web applications using React and Next.js, with a solid understanding of routing, state management, and data grid implementations.

Key Responsibilities

• Develop and maintain user-facing features using React and Next.js.
• Implement routing logic using React Router or Next.js routing.
• Manage application state using Redux, Zustand, or other modern state management libraries.
• Integrate and customize AG Grid for complex data presentation and manipulation.
• Collaborate with UX/UI designers to translate designs into responsive, accessible interfaces.
• Optimize applications for performance, scalability, and SEO (especially in Next.js).
• Write clean, maintainable, and testable code following best practices.
• Participate in code reviews, sprint planning, and team discussions.
• Stay up-to-date with emerging front-end technologies and frameworks.

Required Skills & Experience

• 5+ years of experience with React.js, including leading front-end projects or teams.
• Strong proficiency in JavaScript/TypeScript.
• Up to date with latest React.js versions
• Solid understanding of React Router and routing paradigms.
• Experience with Redux, Zustand, or other state management tools.
• Hands-on experience with AG Grid or similar data grid libraries.
• Familiarity with RESTful APIs, GraphQL, and async data fetching.
• Knowledge of HTML5, CSS3, SASS/SCSS, and responsive design.
• Experience with Git, GitLab, CI/CD pipelines, and modern development workflows.
• Understanding of accessibility (WCAG) and cross-browser compatibility.

Nice to Have

• Experience with Next.js
• Experience with server-side rendering (SSR) and static site generation (SSG) in Next.js.
• Familiarity with testing frameworks like Jest, React Testing Library, Cypress.
• Exposure to design systems and component libraries (e.g., MUI, Ant Design).
• Knowledge of performance profiling and web vitals.

Education

• Bachelor’s degree in Computer Science, Engineering, or related field (or equivalent experience).

What We Offer

• Competitive salary and benefits package.
• Flexible working hours and remote work options.
• Collaborative and inclusive team culture.
• Opportunities for professional growth and learning.

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.

Location: Colombo, Sri Lanka

Time Type: Full time