Senior Frontend Engineer

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accessibilityapiauthenticationautomationci cddeveloper experiencejavascriptoauthopenidreacttest automationtypescriptJavaScriptTypeScriptReactCI/CD

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 to our customers
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

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

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