Urgent Java Web App Development

I need a capable Java developer to create a web application for me, and I need it done within a day. The application will be deployed on an on-premise server.

Key Requirements:
- Proficiency in Java
- Experience with web application development
- Familiarity with on-premise server deployment
- Ability to deliver within tight deadlines

Please note that the specific core functionalities of the application have not yet been determined, so flexibility and the ability to offer suggestions based on best practices will be highly valued.