add some functionality to already existing react + firebase web app

I am looking for a developer to add some functionality to an existing react + firebase web app. The specific functionality that needs to be added is extending the app by adding a new user entities.

Skills and Experience:
- Strong experience in React
- Familiarity with Firebase
- Knowledge of user authentication and database integration
- Ability to enhance the UI of the web app

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