Senior React Engineer
Role details
Job location
Tech stack
Job description
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 Front End 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 (eg 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 (eg 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)
Requirements
- 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 (eg 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 (eg Terraform)
- Experience working with Real Time trading or data visualisation platforms
Benefits & conditions
Package:
- Initial 12 month contract (high possibility of extension)
- Up to £800 p/day (dependent on level of experience)
- On-site (Central London)
