Senior React Engineer - £700 - £800 p/day - On-site (Central London) OverviewWe are hiring a Senior React Engineer to join a high-performance technology team within a leading financial services organisation operating in the oil and energy derivatives space. The business runs a cutting-edge electronic trading platform that serves both internal trading teams and external clients, offering low-latency, highly reliable trading access via a modern UI. We are looking for a self-starter who takes ownership of technical challenges and delivers robust solutions, with the ability to work under pressure in a fast-moving trading environment. You must also be a collaborative team player who communicates clearly and contributes to a high-quality engineering culture. Role andamp; ResponsibilitiesDesign, build, and maintain a React/TypeScript trading UI, delivering Real Time streaming data and a seamless user experienceIntegrate the UI with RESTful and streaming APIs (built in Rust and Python)Own performance improvements across dashboards, widgets, and live data visualisationCollaborate with QA and DevOps to enhance automated testing and deployment pipelinesLead efforts in securing, scaling, and monitoring the Front End environmentUse observability tools (Prometheus, Grafana, Loki) to monitor UI health and performanceDrive UI architectural decisions, performance benchmarking, and best practice implementation Essential Skills and ExperienceDegree in Computer Science, Engineering, or a ..... full job details .....