Looking for a Skilled Full-Stack Developer (React.js & Node.js) for Payment Integration

We have an existing web application built with React.js and Node.js, and we need a skilled developer to build and integrate a specific feature. This is a short-term task that should take approximately 1 week (or around 15–30 hours of work). The Task Includes: • Implementing payment integration on the frontend using React. • Creating/updating corresponding REST API endpoints in Node.js (Express/NestJS) and connecting them to the database MongoDB. • Ensuring smooth integration, responsive design, and proper error handling. What is Already Prepared: • Detailed task requirements/UI mockups (Figma). • Fully functional backend architecture and frontend boilerplate (clean codebase). • Dev environment ready for onboarding. • Requirements: • Strong experience with React.js and Node.js (Full-Stack capability). • Ability to read and understand an existing codebase quickly. • Clean Git workflow (working with feature branches, descriptive commits). • Available to start immediately and dedicate enough time to finish within a week. How to Apply To avoid automated spam, please start your proposal with the word "Sprint". 1. Link to your GitHub or a specific React project you've built. 2. Confirm you are available to start TODAY. 3. What is your preferred state management tool for a task of this scale?