Overview:
With 4,300 employees and over 400,000 retail and institutional clients across more than 80 offices on five continents, StoneX is a Fortune-100, Nasdaq-listed provider connecting clients to the global markets. We focus on innovation, human connection, and delivering world-class products and services to investors worldwide.
At StoneX, you’ll join an institutional-grade financial services organization building modern, high-performance digital platforms. Our teams combine cutting-edge technology, deep domain expertise, and strong engineering culture to deliver scalable and reliable trading experiences.
Responsibilities:
We are seeking a Senior React UI Developer to design and build our next-generation web trading platforms. This role focuses on frontend architecture, performance optimization, and scalable UI development, working closely with backend, mobile, and platform teams.
You will play a key role in shaping UI standards, reusable component systems, and frontend best practices for highly interactive, real-time trading applications.
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Web Trading Platforms
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Design and develop responsive, high-performance web trading applications using React and TypeScript
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Ensure consistent user experiences across browsers and devices
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Component & Design System Development
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Build and maintain reusable UI components and composite components
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Enforce consistent usage of design tokens and UI primitives
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Promote best practices for component composition, accessibility, and maintainability
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State Management & Routing
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Design scalable client-side state management strategies
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Implement robust routing architectures for complex, multi-domain applications
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Performance Optimization
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Implement lazy loading, code splitting, and bundle optimization strategies
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Optimize rendering performance for real-time and data-heavy UIs
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Error Handling & Observability
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Implement error boundaries, logging, and monitoring for frontend applications
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Improve resiliency and debuggability of UI systems
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Authentication Integration
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Integrate frontend applications with IDP-based authentication systems
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Ensure secure handling of sessions, tokens, and user identity flows
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API Integration
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Consume RESTful APIs and event-driven data streams efficiently
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Collaborate with backend teams to define frontend-friendly API contracts
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Cross-Functional Collaboration
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Work closely with product managers, designers, backend engineers, and QA teams
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Translate business and UX requirements into scalable frontend solutions
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Technical Leadership
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Mentor junior and mid-level developers
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Drive frontend best practices, architectural consistency, and code quality
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Stakeholder Communication
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Clearly communicate technical decisions, trade-offs, and implementation approaches
Qualifications:
To succeed in this role, you will need:
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5+ years of professional frontend development experience
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Expert knowledge of JavaScript and TypeScript (ES6+, async programming, closures, types)
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Strong experience with React, including:
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Hooks and component patterns
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Lazy loading and code splitting
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Error boundaries and error capturing
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State management libraries
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Routing architectures
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Strong understanding of frontend performance optimization techniques
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Experience integrating with authentication and authorization systems
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Solid understanding of RESTful APIs and frontend-backend integration
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Experience building trading, financial, or real-time data platforms
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Familiarity with React Native or shared web/mobile UI strategies
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Experience working within large-scale design systems
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Understanding of CI/CD pipelines and frontend build tooling
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Experience working in regulated or security-sensitive environments
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Bachelor’s or Master’s degree in Computer Science, Engineering, or a related field (or equivalent practical experience)
