Frontend in react.js type script and backend in java spring boot

I am looking for a frontend developer with experience in React.js and TypeScript, as well as a backend developer with expertise in Java Spring Boot. The project involves adding specific features and functionalities to an existing app, which will be outlined in a provided PDF.

Frontend Requirements:
- User authentication and authorization
- Responsive design for mobile and desktop
- Integration with external APIs

Backend Requirements:
- No specific requirements or preferences, I trust your expertise
- Database integration and management
- Integration with third-party services

Timeline:
- The project needs to be completed within 1 day.