Senior React Engineer in London

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Senior React Engineer - £700 - £800 p/day – On-site (Central London)

 

Overview

We 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 & 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 

Essential Skills and Experience



Degree in Computer Science, Engineering, or a related field

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 

Desirable Skills and Experience



Experience deploying apps to the Apple App Store

Knowledge of web security best practices and cyber threat mitigation

Familiarity with microservices and REST API architecture

Exposure to Infrastructure as Code tools (e.g. Terraform)

Experience working with real-time trading or data visualisation platforms 

Package:



Initial 12 month contract (high possibility of extension)

Up to £800 p/day (dependent on level of experience)

On-site (Central London)

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