React/JS Developer

React/JS Developer – London, UK (Hybrid) - £530 - £580/Day (Inside IR35)

Electronic trading specialist

Background

The E-Fixed income Development Team is responsible for implementing low latency, high performance and real-time electronic trading systems. The team has recently completed the replacement of a legacy Java Swing UI with a suite of apps based on the OpenFin/Here platform and React/JS. A React specialist is required to help grow and maintain the shared app framework and component library, ensure a consistent and intuitive UX across the suite of apps and work on new business-facing deliverables.

Summary

The developer will join the eFI team as a React/JS expert, working to extend and improve the key capabilities of our apps, and assisting colleagues with less front-end experience in delivering new features.

The business is ever changing and demands an agile development culture. The candidate must have a proven track record of being able to work in a highly dynamic environment with demanding clients and aggressive schedules. The successful candidate will gain excellent exposure to these business areas as well as the opportunity to work in a technically challenging, delivery-focused environment.

While maintenance of the existing platform and interaction with the various eFI teams is a key part of the role, there is also the opportunity to shape the future of the platform through projects and ongoing business requirements.

Key Requirements (Work Experience/Formal Education)

Essential:

• Solid understanding of core JavaScript concepts (ES6+).
• Proven experience in developing user interfaces with React.
• Write clean, well-documented, and testable code.
• Strong proficiency in CSS, including experience with CSS Modules for component styling.
• Experience with front-end build tools and workflows (e.g., Webpack, Babel, npm/yarn).
• Familiarity with state management libraries and patterns (e.g., Redux).
• Experience with unit and integration testing frameworks (e.g., Jest, React Testing Library).
• Excellent problem-solving and analytical skills.
• Strong communication and collaboration skills.
• Ability to work independently and as part of a team in an Agile environment.

Desirable:

• Experience with the Java programming language / Java back-ends.
• Familiarity with desktop application development frameworks such as OpenFin/Here.
• A willingness to learn and embrace new technologies
• Experience working on user interfaces for trading systems or other financial applications.
• Understanding of financial data and workflows, particularly within the fixed income domain.
• Experience with charting libraries (e.g., Chart.js, Recharts).
• Knowledge of accessibility best practices (WCAG).
• Experience with CI/CD pipelines.

Key Responsibilities and Accountabilities:

• Design, develop, and maintain user interfaces for our suite of desktop applications using React and JavaScript.
• Take ownership of standardising the UX across all applications, ensuring a consistent and intuitive user experience.
• Develop and enhance our UI framework and shared component libraries to promote code reusability and maintainability.
• Implement new features and functionalities within the existing application landscape.
• Collaborate effectively with backend developers, product owners and testers throughout the software development lifecycle.
• Participate in code reviews to ensure code quality and knowledge sharing.
• Troubleshoot and resolve technical issues related to the front-end applications.
• Contribute to the continuous improvement of our development processes and tooling.
• Identify areas of improvement and performance tuning to eliminate any bottlenecks
• To work with Financial Engineers, Business representatives and Business Analysts to understand the business needs and design potential solutions.
• Provide 3rd Line support to existing systems to resolve problems, educate 1st/2nd Line RTB and continually improve the functionality and service levels to the business.