Front End Developer – UI (React/TypeScript)

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 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.