Health Data Streamgraph Creation in JavaScript

I need a skilled JavaScript developer to create a streamgraph visualizing health data. The graph should have interactive components, specifically tooltips with detailed information.

Key Responsibilities:
- Code an interactive streamgraph in JavaScript
- Implement tooltips that provide detailed data information upon interaction
- Initial data presentation set to display by time period

Ideal Skills and Experience:
- Proficient in JavaScript with a strong focus on data visualization libraries
- Previous experience with creating streamgraphs or similar visualizations
- Strong understanding of health data and its visualization
- Excellent attention to detail and ability to implement interactive components