Senior Frontend Engineer – SDK & Security API

Requirements

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

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• Proven of experience in frontend development, with deep expertise in React, TypeScript, and modern JavaScript

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• Proven experience designing and maintaining SDKs or libraries used by other developers

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• Strong understanding of OAuth2, OpenID Connect, and secure authentication flows

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• Familiarity with CI/CD pipelines, automated testing, and versioning strategies for SDKs

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• Experience with frontend performance optimization, cross-browser compatibility, and accessibility standards

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• Passion for clean code, automation, and continuous improvement

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• Excellent interpersonal skills and a passion for developer experience and security.ROLE PROFILE:

What the job involves

• We are seeking a Senior Frontend Developer to join our Customers Identity & Access Management team at LSEG

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• 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 to our customers

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• Own and maintain a JavaScript SDK built with React and TypeScript, enabling secure integration with our custom Secure Token Service

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• Design intuitive, developer-friendly APIs that abstract complex authentication flows (OAuth2, OpenID Connect)

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• Ensure the SDK is secure, performant, and easy to integrate across a wide range of frontend applications

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• Collaborate with backend engineers to align SDK functionality with evolving identity protocols and token flows

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• Build automated tests and CI pipelines to ensure quality, reliability, and backward compatibility

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• Write clear documentation and sample apps to support internal and external developers

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• Stay current with frontend security best practices and contribute to platform-wide improvements

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