Finish & Deploy Existing Full-Stack Fragrance Web App – React, Node.js, PostgreSQL, Stripe & AI

I am looking for an experienced full-stack developer to finish, debug, and prepare for production an existing fragrance web application called Scent Layer.
This is NOT a project that needs to be built from scratch. The application already exists, the source code is on GitHub, the frontend is deployed and working, the backend is running, and the PostgreSQL database has already been configured.
Current technology stack:
- React + Vite frontend
- Node.js + Express backend
- PostgreSQL
- Prisma ORM
- Anthropic Claude API / AI features
- Stripe payments
- Email integration
- JWT authentication
- GitHub
- FastComet / cPanel hosting
Current status:
- Frontend is already live and working.
- Backend/API has been deployed.
- PostgreSQL database is created and connected.
- Prisma database structure is installed.
- Existing fragrance database has been seeded.
- User authentication and multiple application features already exist in the code.
- AI functionality is implemented but currently needs its Anthropic model/API configuration corrected.
- Stripe still needs final production configuration and testing.
What I need:
I need someone to review the existing application, fix the remaining deployment/configuration problems, and test the entire platform from beginning to end.
This includes authentication, customer accounts, fragrance tools, AI features, database operations, orders, Stripe checkout/payments, emails and any other existing functionality.
The developer should also identify and fix any bugs or dependency/server issues that appear during testing.
I also need an Admin Dashboard if the existing codebase does not already contain one. The admin area should allow me to manage important business operations such as customers, orders, order status/shipping, fragrances/products and inventory.
Very important: I do NOT want the application redesigned or rebuilt. I want someone capable of understanding the existing codebase and completing it.
All modifications must remain in my GitHub repository, and the final application must be fully operational on my existing hosting environment.
Final goal: A stable, production-ready Scent Layer website where customers can create accounts, use the fragrance and AI tools, place and pay for orders, receive the appropriate emails, and where I can manage the business through an admin interface.
Please tell me about your experience with React, Node.js/Express, PostgreSQL/Prisma, Stripe, Anthropic/Claude APIs, and cPanel/Node.js deployments.
If interested, I can provide the GitHub repository for you to review before giving me a final quote.