L
London Stock Exchange
Senior Frontend Engineer
Skills
ReactTypescriptWorkdayJavascript
2 months ago
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Important information
Contract type:
Permanent
Location:
London, UK
Work mode:
Onsite
Published on:
20 August 2026
What they need
- 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
- Strong understanding of OAuth2, OpenID Connect, and secure authentication flows
- Passion for clean code, automation, and continuous improvement
- Excellent interpersonal skills and a passion for developer experience and security.ROLE PROFILE:
- Familiarity with CI/CD pipelines, automated testing, and versioning strategies for SDKs
- Proven experience designing and maintaining SDKs or libraries used by other developers
- Experience with frontend performance optimization, cross-browser compatibility, and accessibility standards
- Proven of experience in frontend development, with deep expertise in React, TypeScript, and modern JavaScript
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