As someone who worked at a CDN for years, I imagine the code is the easiest technical part. Managing the infrastructure, network connectivity, load balancing, and capacity planning would be the harder parts, outside of the sales and marketing bits.

If you don’t get all of those parts right, you are going to end up measuring your own bandwidth rather than the client’s.

This.

The website, and backend code for the test. 10% of the software work. Which is what everyone seems to think.

The code to managing the infrastructure, network connectivity, load balancing, and capacity planning is the 90% of the software part. But even then it is only 10% of the technical thing.

Getting all the ISP onboard to have your server in their network / exchange and to deal with you, takes more time and effort then all the software part. But even then it is only 10% of the project.

The remaining 90%? Non technical part for Sales and Marketing and getting user traction.

To put that into perspective, the website can be done in a weekend was only 0.01% of the work.