Requirements
Must have:
- 5+ years of experience in frontend/UI engineering, with a focus on performance and scale - Deep expertise in React, TypeScript, and JavaScript - Strong understanding of WebSocket integration, low-latency data streaming, and threading - Experience troubleshooting data-heavy UIs and optimising load times - Familiarity with tools like Redis, Kafka, and cloud platforms such as Azure or AWS - Proficient in Git and modern source control workflows - Knowledge of performance diagnostics (e.g. Google PageSpeed Insights) and responsive UI optimisation
Responsibilities:
- Design, build, and maintain a React/TypeScript trading UI, delivering real-time streaming data and a seamless user experience - Integrate the UI with RESTful and streaming APIs (built in Rust and Python) - Own performance improvements across dashboards, widgets, and live data visualisation - Collaborate with QA and DevOps to enhance automated testing and deployment pipelines - Lead efforts in securing, scaling, and monitoring the frontend environment - Use observability tools (Prometheus, Grafana, Loki) to monitor UI health and performance - Drive UI architectural decisions, performance benchmarking, and best practice implementation
Company:
We are hiring a Senior React Engineer to join our high-performance technology team within a leading financial services organisation operating in the oil and energy derivatives space. Our 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. This role offers a competitive package of up to £140,000, with an up to 20% bonus and excellent corporate benefits, all based in Central London.