Senior Frontend Developer (Remote)

our Backend team, who own the low-latency C++/Go trading engine. You’ll own complex, ambiguous, performance-critical work end-to-end designed, built, tested, deployed, and supported in production. Occasional hours outside the normal working day are required for production releases, scheduled maintenance windows, and Level 3 support during critical incidents. Complex full-stack features in TypeScript and Rust from trader-facing interfaces to the application services behind them Real-time market-data presentation and high-throughput, low-latency application code across FX, Equities, and Cryptocurrency React and reactive state management (RX, MobX, or similar) for demanding, data-dense trading interfaces Distributed systems and real-time data over REST, WebSockets, and network protocols Observability and monitoring dashboards, alerting, and metrics that make frontend behaviour visible Strong full-stack engineering ability with deep TypeScript / JavaScript (ES6+) (5+ years) Solid experience

with React and reactive state management (RX, MobX, or similar) If your Rust is still developing, a strong track record of picking up new languages to depth quickly is essential Strong grasp of distributed systems, API design, and real-time data (REST, WebSockets, network protocols such as TCP/UDP and binary protocols) Python for scripting, automation, and tooling is a bonus Git and Linux fundamentals Experience in financial services or trading technology is a plus but not essential You ship. Senior here means trusted, not just experienced Clear, proactive communication especially when things go wrong is essential You embrace AI tooling. We use AI tools (Claude, Gemini) to amplify our engineering capability from code review and debugging to incident investigation and documentation. Real problems trading systems where performance is measured in microseconds, not user clicks Competitive package up to 30 days leave + bank holidays, private health insurance, pension, life insurance

Senior Frontend Engineer Remote (UK-based) Full-Time Have you got what it takes to succeed The following information should be read carefully by all candidates. Reactive Markets is the 2026 OTC Trading Platform of the Year ( ). Our network handles over 50 billion in daily trading volumes across FX, Equities, and Cryptocurrency, connecting 40+ of the world’s leading liquidity providers. We build trading systems that operate at the edge of what’s technically possible where nanoseconds matter and a dropped message costs real money. Our engineering team is small, senior, and deeply invested in the craft of building cutting edge, reliable, high-performance systems. We’re looking for a senior full-stack engineer to build the trading platform our clients use every day. Despite the “frontend” name, this is not a UI-only role our Frontend team works across the whole application stack in TypeScript and Rust, from the trader-facing interfaces down to the services behind them. It’s distinct from