Urgent Full-Stack Developer Needed – E-commerce Bug Fixes

I’m looking for an experienced Full-Stack Developer to troubleshoot and fix critical issues in my existing e-commerce digital shop.

Tech Stack:
- React frontend
- Python backend
- REST APIs
- Existing database

Main Issues:
- API integration issues between the React frontend and Python backend, causing incorrect or missing data
- Checkout/payment and order-processing failures
- Digital product delivery, authentication, or session-related issues

The existing application is mostly built, so the main task is to identify the root causes, fix the frontend/backend/API issues, and test the complete customer purchase flow.

Requirements:
- Strong React + Python experience
- Solid REST API integration and debugging skills
- Experience with e-commerce, payments, authentication, and databases
- Comfortable working with an existing codebase
- Available to start immediately
- Must complete the work within 2 days, no later than this weekend

Please apply only if you can start immediately and meet this tight deadline. Include relevant examples of similar full-stack debugging work.