Senior Frontend Engineer
London Stock Exchange Group7 months ago
London, United KingdomSenior
Responsibilities
- Own and maintain a JavaScript SDK built with React and TypeScript.
- Design developer-friendly APIs that abstract OAuth2 and OpenID Connect authentication flows.
- Ensure the SDK is secure, performant, accessible, and compatible across browsers and frontend applications.
- Collaborate with backend engineers on identity protocols and token flows.
- Build automated tests and CI pipelines for quality, reliability, and backward compatibility.
- Write documentation and sample applications for internal and external developers.
- Contribute to frontend security best practices and platform-wide improvements.
Requirements
- Proven frontend development experience with deep expertise in React, TypeScript, and modern JavaScript.
- Experience designing and maintaining SDKs or libraries used by other developers.
- Strong understanding of OAuth2, OpenID Connect, and secure authentication flows.
- Familiarity with CI/CD pipelines, automated testing, and SDK versioning strategies.
- Experience with frontend performance optimization, cross-browser compatibility, and accessibility standards.
- Strong interpersonal skills and an interest in developer experience, clean code, automation, continuous improvement, and security.
Benefits
- Flexible hybrid work model, healthcare, retirement planning, paid volunteering days, wellbeing initiatives, access to learning opportunities and certifications, conference support, internal mobility, and a collaborative culture with performance-based rewards.
Tech Stack
Categories
About London Stock Exchange Group
London Stock Exchange Group (LSEG) provides market infrastructure, financial data, and analytics to banks, asset managers, and corporations. Its businesses span capital markets (London Stock Exchange), post-trade clearing (LCH), and information services including FTSE Russell indices and the Refinitiv data platform, funded by transaction fees, subscriptions, and licensing. Headquartered in London and publicly listed on the LSE, the group serves global customers seeking trading, clearing, benchmarks, and enterprise data solutions.