Lead Software Engineer

Senior Frontend Developer

We are seeking a Senior Frontend Developer to join our Customers Identity & Access Management team at LSEG. You will play a pivotal role in maintaining and evolving our JavaScript SDK, a critical interface that enables secure authentication and seamless integration of our Authentication into client applications across our customers.

This role is ideal for someone who thrives in developer experience, SDK design, and security-focused frontend engineering.

What You'll be doing:

• Own and maintain a JavaScript SDK built with React and TypeScript, enabling secure integration with our custom Secure Token Service.
• Design intuitive, developer-friendly APIs that abstract complex authentication flows (OAuth2, OpenID Connect).
• Ensure the SDK is secure, performant, and easy to integrate across a wide range of frontend applications.
• Collaborate with backend engineers to align SDK functionality with evolving identity protocols and token flows.
• Build automated tests and CI pipelines to ensure quality, reliability, and backward compatibility.
• Write clear documentation and sample apps to support internal and external developers.
• Stay current with frontend security best practices and contribute to platform-wide improvements.

What You'll bring:

• Proven experience in frontend development, with deep expertise in React, TypeScript, and modern JavaScript.
• Proven experience designing and maintaining SDKs or libraries used by other developers.
• Strong understanding of OAuth2, OpenID Connect, and secure authentication flows.
• Familiarity with CI/CD pipelines, automated testing, and versioning strategies for SDKs.
• Experience with frontend performance optimization, cross-browser compatibility, and accessibility standards.
• Passion for clean code, automation, and continuous improvement.
• Excellent interpersonal skills and a passion for developer experience and security.

What you'll get in return:

• Competitive compensation with performance-based rewards.
• A flexible hybrid work model that supports work-life balance.
• Access to cutting-edge tools and infrastructure to do your best work.
• Opportunities for continuous learning, including certifications, conferences, and internal mobility.
• A collaborative culture that values technical mastery, ownership, and innovation.
• The chance to work on a globally critical system that powers secure financial transactions across markets.

LSEG in India is Great Place to Work certified (Jun '25 – Jun '26). Learn more about life and purpose of our company directly from India colleagues' video.

Career Stage: Manager

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.