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, Type Script, and modern Java Script
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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:

• 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 Type Script, 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