Front-End React Software Engineer : Trading : £120-180k plus excellent bonus : London

We’re partnering with a high-performance quantitative trading firm to hire a Front-End Engineer (React) to help shape the internal platforms that power their trading, research, and risk decision-making. If you care about architecture, performance, and building interfaces that hold up under pressure, this is firmly in your lane.

The Role

You’ll take ownership of complex, data-rich web applications that surface live market data, research insights, and trading activity in real time. These are mission-critical tools used by traders and quantitative researchers operating in fast-moving environments.

Expect to think deeply about latency, rendering performance, and information density , not just UI polish. You’ll work side-by-side with backend engineers, quants, and traders to design interfaces that remain fast, reliable, and intuitive even when the data is moving quickly and the stakes are high.

Key Responsibilities

• Build and evolve advanced React applications used in live trading and research workflows
• Design scalable front-end architectures and reusable component systems
• Optimise performance for real-time, high-volume data visualisation
• Partner with backend engineers on APIs, data contracts, and system design
• Deliver well-tested, maintainable code with a strong bias toward correctness and reliability

Core Technical Requirements

• Strong commercial experience with React and modern TypeScript/JavaScript
• Deep understanding of front-end architecture, state management, and component design patterns
• Experience working with large, rapidly changing datasets in the browser
• Strong grasp of performance optimisation (rendering strategies, memoisation, data flow)
• Comfort working in a Linux-based, Git-driven engineering environment
• BSc or MSc in Computer Science or similar

Additional Technologies:

• Next.js or other modern React frameworks
• WebSockets, streaming data, or real-time UI systems
• D3.js, advanced charting, or custom data visualisation work
• Backend experience with Python, C++, Java, or Go
• Familiarity with GraphQL, REST APIs, or event-driven architectures

Bonus:

• Exposure to financial markets, trading systems, or time-series data
• Experience collaborating closely with quants or highly technical end users
• Familiarity with front-end testing/tooling (Jest, Playwright, etc.)
• Interest in UI/UX, balanced with strong engineering discipline