Solo developer wanted.

I have a python flask application I’ve written. 

User accounts are based on ‘flask-security-too’

It allows the user to upload data and make a report.

User uploads, reports, and some intermediate files are stored in a user workspace.

The backend is aws s3, with a dynamodb managing some metadata.

I’d like users to be able to share files in their workspace with each other. 

I’d like to be able to meter their disk space usage, and invoice it.

Stripe based fixed monthly payments are already in place.

If this sounds like something you have previous relevant experience with, I’d like a short description of what you’d build. 

I’d like a roadmap of what milestones you’d deliver along the way and a price estimate for each of the first 5.

I expect to receive code from you via a shared git repository.

I will do some customization on your milestone 1, before you deliver milestone 2.

Please specify an hourly rate for your work in response to my customizations.