Web based system to vectorize images

I need a web app.
The final photo will be cut on cutter plotter.
1. Front end:
– simple button for uploading the photo (also drag and drop). Should work if accessed from mobile phones (access the folders and choose the photo)
– 3 options for vectorization: simple, medium, advanced.

The photo will be processed in the backend.
The result will be 2 downloads:
– vectorized photo, colorized, cuttable on cutter plotter;
– the same photo, contours only with numbers instead of colours. And a legend for those colours, as they were in the colored vectorized picture in the point above.

The project will be accepted based on a public webpage test and delivered as full source code.

The tehnology to be used is up to tbe developer.
Any third party that would be included in the offered solution should be open source or the developer should fully detail it and it’s cost and license type and limitations (open source, free, monthly subscription, one time cost, etc.).