Front End Developer – UI (React/TypeScript)

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

Benefits offered by this job

Competitive salary

Flexible schedule

Medical insurance

Sports benefits

Professional development

Job summary

Grid Dynamics in London is seeking Front End Engineers to modernise electronic trading applications by replacing legacy Angular and desktop tech with high-performance React interfaces used by traders worldwide.

As part of embedded engineering, you’ll deliver mission-critical trading UI, consume live market data, and optimise browser performance for large streaming datasets. You’ll collaborate with backend Java engineers and contribute to reusable components and platform tooling.

Qualifications

• Strong commercial experience with React and TypeScript.
• Experience delivering complex production front-end applications.
• Excellent understanding of browser rendering and performance optimisation.
• Experience consuming real-time streaming data via WebSockets or similar.
• Strong async programming and responsive UI design.
• Collaborating across the full tech stack with backend Java services.
• Experience with automated testing (Playwright, Cypress or Selenium).
• Solid Agile development experience.

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 messaging tech.
• Optimise rendering, memory usage and performance for large datasets.
• Develop reusable UI components and shared frameworks.
• Migrate legacy Angular apps to modern React architecture.
• Collaborate with backend Java engineers on end-to-end solutions.
• Build automated UI tests with Playwright or Cypress.
• Contribute to architecture, reviews, and best practices.
• Deploy via CI/CD into containerised production.

Skills

React

TypeScript

Web performance

WebSockets

RSocket

Asynchronous UI

Agile

Testing frameworks

Tools

Playwright

Cypress

Selenium

ag-Grid

OpenShift

Job description

Our embedded engineering teams 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.

This is an opportunity to work on technically demanding software where milliseconds matter. You'll build responsive, low-latency trading interfaces, consume live market data, optimise browser performance for high-volume streaming applications and help shape the next generation of front-office trading technology.

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.
• Optimise browser rendering, memory usage and application performance for large streaming datasets.
• 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.

Requirements

Essential Skills

• Strong commercial experience with React and TypeScript.
• Experience delivering complex production front-end applications.
• Excellent understanding of browser rendering, performance profiling, memory management and optimisation.
• 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.

Technology Stack

Front End

• React
• TypeScript
• ag-Grid
• HTML5
• CSS3
• Modern JavaScript

Real-Time Technologies

• WebSockets
• RSocket
• Solace
• Simple Binary Encoding (SBE)
• Streaming Market Data

Backend

• Java
• Spring Boot
• REST APIs
• Microservices

DevOps & Platform

• OpenShift
• Tekton
• CI/CD Pipelines
• Containers

Testing

• Playwright
• Cypress
• Selenium

AI Development

• GitHub Copilot (including Agent Mode)
• Modern AI-assisted engineering tools

Nice to have

Desirable Skills

• 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.

We offer

• Opportunity to work on bleeding-edge projects
• Work with a highly motivated and dedicated team
• Competitive salary
• Flexible schedule
• Benefits package - medical insurance, sports
• Corporate social events
• Professional development opportunities
• Well-equipped office

About Us

Grid Dynamics (NASDAQ: GDYN) is a leading provider of technology consulting, platform and product engineering, AI, and advanced analytics services. Fusing technical vision with business acumen, we solve the most pressing technical challenges and enable positive business outcomes for enterprise companies undergoing business transformation. A key differentiator for Grid Dynamics is our 8 years of experience and leadership in enterprise AI, supported by profound expertise and ongoing investment in data, analytics, cloud & DevOps, application modernization and customer experience. Founded in 2006, Grid Dynamics is headquartered in Silicon Valley with offices across the Americas, Europe, and India.