Senior Frontend Engineer

London Stock Exchange · Financial Services · Stock Exchanges & Market Infrastructure · JavaScript · TypeScript · 9 days ago

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Salary

≈ $63k – $174k per year (Estimated)

Location

In office (London)

Seniority

Senior

Employment

Full-Time

Confirmed on the employer's own hiring board on Nov 5, 2026. First seen by Alion on Sep 20, 2026. London Stock Exchange scores B on the Alion truth index.

Overview

Company

Impact

Profile match

London Stock Exchange

Headquartered in London, United Kingdom, the London Stock Exchange is one of the world's oldest and most prominent financial exchanges. It provides international capital markets, premier listing venues such as the Main Market and AIM, and electronic trading infrastructure for equities, bonds, and exchange-traded funds. As a core subsidiary of the London Stock Exchange Group, it connects global issuers with investors to facilitate efficient capital formation, market liquidity, and economic growth.

londonstockexchange.com · HQ: London, United Kingdom · Financial Data & Market Intelligence · Stock Exchanges & Market Infrastructure · 1001-5000 employees · Est. 1801

Tech stack of London Stock Exchange

Backed by Unreasonable

Join LSEG as a Senior Frontend Engineer in our Customers Identity & Access Management team. You will be responsible for maintaining and evolving our JavaScript SDK, designing intuitive APIs, ensuring security and performance, collaborating with backend engineers, building automated tests, and writing clear documentation. This role is ideal for someone with a passion for developer experience, SDK design, and security-focused frontend engineering.

Missions

Maintaining and evolving the JavaScript SDK, ensuring it is secure, performant, and easy to integrate.
Designing intuitive, developer-friendly APIs that abstract complex authentication flows (OAuth2, OpenID Connect).
Collaborating with backend engineers to align SDK functionality with evolving identity protocols and token flows.

Profil recherché

- 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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