Front-End Developer (Freelance)

A personal arbitrage trading project is seeking a front-end developer to refine and accelerate a React-based user interface. The application is functional but needs focused upgrades to responsiveness, rendering efficiency, and UX clarity across real-time market views. The role centers on performance profiling, UI/UX improvements, and front-end architecture optimizations that streamline data-heavy screens. This is a remote, part-time contract position suited to a mid-level professional experienced in building high-performance dashboards and real-time interfaces.

Responsibilities

• Audit the current React codebase to identify rendering bottlenecks, excessive re-renders, and inefficient state flows.
• Implement performance optimizations (memoization, virtualization, code-splitting, selective re-renders) to improve perceived and actual speed.
• Refactor state management for responsiveness and clarity; improve data handling for streaming/rapid updates (e.g., WebSocket-driven UI).
• Enhance core views such as market overview, opportunity listings, order/book tables, and execution history for legibility and speed.
• Introduce or refine design system components (buttons, tables, modals, toasts) to ensure consistency and accessibility.
• Improve charting and tabular data experiences (pagination, sorting, filtering, column pinning) with minimal latency.
• Establish metrics and profiling routines (React Profiler, performance marks, Core Web Vitals proxies) and create a lightweight performance budget.
• Optimize network usage for real-time data: request batching, debouncing, stale-while-revalidate patterns where appropriate.

Skills and Requirements

• Strong proficiency with React in production environments; experience improving performance in data-intensive apps.
• Solid understanding of modern JavaScript and TypeScript, component composition, and React hooks.
• Experience with state management patterns (Context, Redux Toolkit, Zustand, or similar) and query/data libraries (React Query/SWR).
• Experience with data visualization and complex tables (e.g., Recharts, Victory, ECharts, TanStack Table, ag-Grid).
• Competence in UI/UX fundamentals, responsive design, and accessibility (WCAG-aware).
• Comfort with tooling: Vite/webpack, ESLint/Prettier, Jest/RTL, and React Profiler/DevTools.
• Ability to work independently on a part-time, remote contract; clear communication and structured delivery.
• Bonus: knowledge of financial/trading UI patterns (order books, spreads, latency cues) and basic understanding of arbitrage concepts.

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