Front End Developer – UI (React/TypeScript)

JUXT; Greater London; On-site; GBP 70,000 - 110,000; Full time

Job summary

JUXT in London is seeking Front End Engineers to join our embedded team, delivering high-performance React applications for trading platforms. You will modernise legacy Angular/AngularJS systems and work closely with backend Java engineers.

You’ll contribute to UI components, architecture, and automated UI testing with Playwright or Cypress, while solving challenges in real-time data processing and scalable front-end design.

Qualifications

• Strong React and TypeScript experience.
• Experience building real-time, production front-end apps.
• Experience migrating Angular/AngularJS to React.

Responsibilities

• Design, develop and maintain high-performance React and TypeScript applications.
• Build responsive UIs for pricing, execution and post-trade workflows.
• Consume real-time market data using WebSockets and RSocket.
• Develop reusable UI components and shared frameworks.
• Migrate legacy Angular applications to React architecture.

Skills

React

TypeScript

Real-time data

WebSocket/RSocket

Front-end performance

Agile

Team collaboration

UI testing (Playwright/Cypress)

Tools

Playwright

Cypress

Selenium

ag-Grid

Kubernetes

OpenShift

RSocket

Job description

Our embedded engineering teams at JUXT work alongside client technology organisations, delivering modern software across electronic trading, capital markets and enterprise platforms.

We're looking for talented Front End Engineers to join our London embedded engineering team. You'll be working with a Tier 1 investment bank, helping modernise a suite of electronic trading applications by replacing legacy Angular and desktop technologies with high-performance React applications used by traders around the world.

The Role

As a Front End Engineer, you'll build mission-critical trading applications that process and visualise real-time market data for front-office users. Working as part of a collaborative engineering team, you'll help deliver modern React applications while contributing to shared engineering standards, reusable UI components and platform tooling.

The work combines modern front-end engineering with distributed systems, messaging technologies and performance optimisation, making it ideal for engineers who enjoy solving complex technical challenges.

Responsibilities

• Design, develop and maintain high-performance React and TypeScript applications.
• Build responsive user interfaces supporting pricing, execution and post-trade workflows.
• Consume and process real-time market data using WebSockets, RSocket and messaging technologies.
• Develop reusable UI components and shared application frameworks.
• Migrate legacy Angular and AngularJS applications onto modern React architecture.
• Collaborate closely with backend Java engineers to deliver end-to-end solutions.
• Build automated UI testing using Playwright, Cypress or similar frameworks.
• Contribute to architecture, code reviews and engineering best practices.
• Deploy applications through modern CI/CD pipelines into containerised production environments.
• Strong commercial experience with React and TypeScript.
• Experience delivering complex production front-end applications.
• Experience consuming real-time streaming data using WebSockets, RSocket or similar technologies.
• Strong understanding of asynchronous programming and responsive UI design.
• Comfortable understanding backend Java services and collaborating across the full technology stack.
• Experience with automated testing frameworks including Playwright, Cypress or Selenium.
• Excellent software engineering fundamentals and Agile development experience.
• Experience migrating Angular or AngularJS applications to React.
• Experience with Solace, Kafka, Tibco EMS, Aeron or similar messaging technologies.
• Knowledge of binary messaging formats including SBE, FlatBuffers or Protocol Buffers.
• Experience working with ag-Grid or enterprise-scale data grid frameworks.
• Financial Markets or Electronic Trading experience, particularly FX.
• Experience with RFQ, RFS, Order Management or Single Dealer Platforms.
• Knowledge of Kubernetes, OpenShift and containerised deployments.