Senior React Engineer

Intec Select Ltd; England; On-site; GBP 100,000 - 125,000; Full time

Job summary

A leading financial services organization is seeking a Senior React Engineer to design and enhance a performance-focused trading UI in Central London. The role demands 5+ years of UI engineering experience and deep expertise in React and TypeScript, emphasizing low-latency data handling. This initial 6-month contract offers competitive pay of up to £800 per day and the possibility of extension, requiring strong collaborative skills and the ability to thrive in a dynamic environment.

Qualifications

• 5+ years of experience in frontend/UI engineering, focusing on performance and scale.
• Deep expertise in React, TypeScript, and JavaScript.
• Knowledge of performance diagnostics and responsive UI optimisation.

Responsibilities

• Design, build, and maintain a React/TypeScript trading UI.
• Integrate the UI with RESTful and streaming APIs.
• Own performance improvements across dashboards and widgets.

Skills

React

TypeScript

JavaScript

WebSocket integration

Performance optimization

Git

Education

Degree in Computer Science or Engineering

Tools

Prometheus

Grafana

Loki

Azure

AWS

Job description

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

We are hiring a Senior React Engineer to join a high-performance technology team within a leading financial services organization 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 6 month contract (high possibility of extension)
• Up to £800 p/day (dependent on level of experience)
• On‑site (Central London)