Overview
Connecting clients to markets and talent to opportunity
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
Position Purpose
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.
Primary ResponsibilitiesFrontend Architecture & Development
- Web Trading Platforms
- Design and develop responsive, high-performance web trading applications using React and TypeScript
- Ensure consistent user experiences across browsers and devices
- Component & Design System Development
- Build and maintain reusable UI components and composite components
- Enforce consistent usage of design tokens and UI primitives
- Promote best practices for component composition, accessibility, and maintainability
- State Management & Routing
- Design scalable client-side state management strategies
- Implement robust routing architectures for complex, multi-domain applications
Performance & Reliability
- Performance Optimization
- Implement lazy loading, code splitting, and bundle optimization strategies
- Optimize rendering performance for real-time and data-heavy UIs
- Error Handling & Observability
- Implement error boundaries, logging, and monitoring for frontend applications
- Improve resiliency and debuggability of UI systems
Security & Integration
- Authentication Integration
- Integrate frontend applications with IDP-based authentication systems
- Ensure secure handling of sessions, tokens, and user identity flows
- API Integration
- Consume RESTful APIs and event-driven data streams efficiently
- Collaborate with backend teams to define frontend-friendly API contracts
Collaboration & Leadership
- Cross-Functional Collaboration
- Work closely with product managers, designers, backend engineers, and QA teams
- Translate business and UX requirements into scalable frontend solutions
- Technical Leadership
- Mentor junior and mid-level developers
- Drive frontend best practices, architectural consistency, and code quality
- Stakeholder Communication
- Clearly communicate technical decisions, trade-offs, and implementation approaches
Qualifications
Required Qualifications
To succeed in this role, you will need:
- 5+ years of professional frontend development experience
- Expert knowledge of JavaScript and TypeScript (ES6+, async programming, closures, types)
- Strong experience with React, including:
- Hooks and component patterns
- Lazy loading and code splitting
- Error boundaries and error capturing
- State management libraries
- Routing architectures
- Strong understanding of frontend performance optimization techniques
- Experience integrating with authentication and authorization systems
- Solid understanding of RESTful APIs and frontend-backend integration
What Will Make You Stand Out
- Experience building trading, financial, or real-time data platforms
- Familiarity with React Native or shared web/mobile UI strategies
- Experience working within large-scale design systems
- Understanding of CI/CD pipelines and frontend build tooling
- Experience working in regulated or security-sensitive environments
Education
- Bachelor's or Master's degree in Computer Science, Engineering, or a related field (or equivalent practical experience)
Working Environment
