IT & Software

Senior Frontend Engineer

London Stock Exchange Group

London · Greater London · United Kingdom

Overview

As a Senior Frontend Developer in our Customers Identity & Access Management team, you will own and evolve our JavaScript SDK (React/TypeScript) enabling secure authentication for client applications. You will design developer-friendly APIs, ensure security and performance, and collaborate with backend engineers to align with identity protocols. You will build tests, CI pipelines, and clear documentation to support internal and external developers. This role combines SDK design, developer experience, and security-focused frontend engineering to support a globally critical system. You’ll work in a growth-focused, collaborative environment that values innovation and continuous improvement.

Pay / Benefits
  • Competitive compensation with performance-based rewards
  • Flexible hybrid work model
  • Access to cutting-edge tools and infrastructure
  • Opportunities for continuous learning, including certifications and conferences
  • Internal mobility
  • Collaborative culture with ownership and innovation
Responsibilities
  • Own and maintain a JavaScript SDK built with React and TypeScript
  • Design intuitive APIs to abstract OAuth2 and OpenID Connect flows
  • Ensure SDK security, performance, and ease of integration across frontend apps
  • Collaborate with backend engineers to align with identity protocols
  • Build automated tests and CI pipelines for quality and backward compatibility
  • Write documentation and sample apps for developers
  • Stay current with frontend security best practices and contribute to platform improvements
Key requirements
  • Frontend development proficiency with React, TypeScript, and modern JavaScript
  • Experience designing and maintaining SDKs or libraries used by developers
  • Strong understanding of OAuth2, OpenID Connect, and secure authentication flows
  • Familiarity with CI/CD, automated testing, and versioning for SDKs
  • Experience with frontend performance optimization, cross-browser compatibility, and accessibility
  • Excellent interpersonal skills
  • passion for developer experience and security
  • React
  • TypeScript
  • JavaScript
  • OAuth2

Reference: WJ-747_30160303

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