Fullstack Developer for Application Enhancement

I'm looking for a skilled fullstack developer with expertise in React.js and Node.js to enhance an existing application. The project involves multiple areas, including:

User Interface (UI) Enhancements:
- Improve User Experience (UX) for better navigation and usability
- Performance optimization to reduce load times and improve responsiveness

Backend Functionality Enhancements:
- Revamp existing APIs or create new ones as needed.
- Improve application logic and workflows for better efficiency.

Database Integration:
- Work with PostgreSQL to optimize database queries and structure.
- Ensure seamless data flow between the application and the database.

AWS and Stripe Integration:
- Set up or enhance AWS services for hosting and storage needs.
- Integrate or optimize Stripe for payment processing.

Ideal Skills and Experience:
- Strong proficiency in React.js and Node.js
- Experience with PostgreSQL and database optimization
- Familiarity with AWS services
- Knowledge of Stripe integration
- Strong background in UI/UX design principles

Please provide examples of similar work done and your approach to handling these enhancements.