We have a current opportunity for a React Developer on a permanent basis. The position will be based in London. For further information about this position please apply. The OpportunityThe ETrading Terminal is the interface through which professional traders and institutions access the world''s most important commodity market - live, with depth and precision no competitor can match. You will own the architecture of that experience. This is not a UI layer on top of a data API. It is a real-time, high-throughput trading interface used by some of the most demanding users in financial markets. You will define how it is built, set the patterns the team follows, and push the boundaries of what a browser-based trading platform can do.Requirements10+ years engineering; 5+ years building production React at scale - component lifecycle, rendering behaviour, and bundle architecture are instinctsTypeScript mastery in strict mode - complex generics, discriminated unions, conditional types, and type-safe API boundary designVite and modern build tooling; tree-shaking, chunk strategy, module federation, and build performance optimisation in CIState management at scale: Zustand, TanStack Query, or equivalent; separation of server, client, and ephemeral UI stateHigh-frequency WebSocket data at tick-by-tick rates - back-pressure handling, dropped-frame detection, and reconnection strategyBrowser internals: rendering pipeline, layout/paint/composite lifecycle, memory profiling, GC pressure, and