Build a Node.js Web App

I'm looking for a Node.js expert to create a new web application from scratch. The main feature of this application will be data visualization.

Key Requirements:
- Design and develop a web application using Node.js.
- Implement data visualization as the primary functionality.
- Connect the application to external APIs for data sourcing.

Ideal Skills:
- Extensive experience with Node.js and web application development.
- Strong skills in data visualization techniques and tools.
- Proficient in working with external APIs.

Please note this project is not just about coding, but also about creating an engaging and intuitive web application.