full-stack developer in graph visualization

We have a working web app prototype built around an interactive hierarchical graph. We need a developer to extend its data model, improve how complex structures render, and refresh the UI. The tech stack and codebase are shared after an NDA is signed.

• Nodes support multiple typed associations, each with its own attributes (type, status, dates, order).
• Child nodes belong to a specific association or to a single parent.
• Parent–child links are typed.
• Associations and links get full CRUD with validation.
• Each association’s children are grouped clearly beneath it, with minimal edge crossings and no overlaps at scale.
• The view supports expand/collapse, zoom, and pan.
• Modernize the node cards, connectors, typography, and colors.
• The layout must be fully responsive.
• Move existing data to the new schema with no loss.

• A track record of interactive graph or tree visualizations, using D3, React Flow, or custom layout algorithms.
• Strong relational data modeling, especially many-to-many relationships with attributes.
• A strong UI design sense.

• All code and IP belong to the client.