Front-End Developer (Freelance)
Posted Today by Twine
Negotiable
Undetermined
Remote
United Kingdom
Summary: A personal arbitrage trading project is looking for a front-end developer to enhance a React-based user interface, focusing on performance profiling, UI/UX improvements, and optimizing front-end architecture. The role is part-time and remote, targeting a mid-level professional with experience in high-performance dashboards and real-time interfaces. Key responsibilities include auditing the React codebase, implementing performance optimizations, and enhancing core views for better user experience. The ideal candidate should possess strong React proficiency and a solid understanding of modern JavaScript and UI/UX fundamentals.
Key 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.
Key Skills:
- 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.
Salary (Rate): undetermined
City: undetermined
Country: United Kingdom
Working Arrangements: remote
IR35 Status: undetermined
Seniority Level: Mid-Level
Industry: IT
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.
About Twine
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