Senior React Engineer

We are seeking a highly skilled Senior React Engineer to join a front-office technology team responsible for building next-generation electronic trading and market data applications. This is an opportunity to work on highly performant, real-time systems used by traders and sales teams globally. You'll be responsible for building responsive, data-intensive user interfaces that process and visualise large volumes of streaming market data while maintaining exceptional user experience and performance. Responsibilities As a Senior React Engineer, you will work closely with frontend, backend and business stakeholders to deliver mission-critical trading applications. You'll play a key role in designing frontend architecture, optimising performance, and ensuring applications remain responsive under heavy data loads. This position is ideal for engineers who enjoy solving complex performance challenges and building sophisticated products in low-latency environments. Key Responsibilities Design and develop high-performance web applications using React and TypeScript.Build and maintain real-time user interfaces consuming large volumes of streaming market data.Optimise browser performance, rendering pipelines, memory usage and application responsiveness.Work closely with backend engineering teams to integrate low-latency data services.Contribute to frontend architecture, technical standards and engineering best practices.Develop robust testing strategies and maintain high levels of application quality.Participate in system design discussions and performance tuning initiatives.Support the evolution of trading and market data platforms used globally. Requirements Essential Skills & Experience Strong commercial experience developing applications using React and TypeScript.Experience delivering production-grade frontend systems in trading, market data, financial services or other high-throughput environments.Deep understanding of browser internals, rendering performance, virtualisation, memory management and frontend optimisation techniques.Experience consuming and managing real-time data feeds using WebSockets, pub/sub messaging or similar technologies.Understanding of concepts such as backpressure, reconnection handling, snapshots and state recovery.Strong understanding of software engineering best practices, testing and code quality.Experience with Playwright, Cypress, Selenium or similar testing frameworks.Ability to understand and troubleshoot backend services, particularly Java-based systems. Nice to have Desirable Experience Experience migrating Angular or AngularJS applications to React.Knowledge of low-latency messaging platforms such as Solace, Tibco EMS, Kafka or Aeron.Familiarity with binary protocols and wire formats including SBE, FlatBuffers or Protobuf.Experience with AG Grid or similar enterprise-grade data grid frameworks.Exposure to containerised deployment environments and cloud-native architectures.Experience building applications for electronic trading, order management, market making, RFQ/RFS workflows or single dealer platforms. Domain Knowledge Experience Within Financial Markets Is Highly Desirable, Particularly In Foreign Exchange (FX)Spot and Forward TradingFX OptionsPricing and Market MakingTransaction Cost Analysis (TCA)Market Data Platforms We offer Opportunity to work on bleeding-edge projectsWork with a highly motivated and dedicated teamCompetitive salaryFlexible scheduleBenefits package - medical insurance, sportsCorporate social eventsProfessional development opportunitiesWell-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.