Please let us know the price and time needed - we will share the existing code upon request.
Example of D3 v4 Treemap layout: https://bl.ocks.org/mbostock/6bbb0a7ff7686b124d80
Example of zoom functionality to be used and converted from d3.v3 (SVG) to d3.v4 (HLML): http://jsfiddle.net/ramnathv/amszcymq/
Any questions, please ask.
The code to be fixed (zoom function): http://codepen.io/znak/pen/ZBExyR
15 freelancers are bidding on average £660 for this job