Java Developer Needed for Vaadin Web App

I'm looking for a seasoned Java developer with professional experience in Vaadin to help me develop a web application.

Note:
- Please only serious and professional developers apply.
- The project is still in its early stages, so there may be opportunities for input into the design and features of the app.
- Ideal skills include: Java, Vaadin, web application development. Experience with user authentication, data visualization, and real-time updates will be a plus.