Hello Dear,
I carefully read your requrements;
Hope you are doing well.
First, I' d like to work for you in free.
After earning your trust, I will try to get your money.
As a 5 years experienced fullstack developer, I can build the backend you want with your desired stack.
Backend: Laravel, ExpreeJS/Nodejs, Django, Ruby on Rails, .Net, spring boot
Integrate Payment SDKs like Paypal, Squarespace, Stripe, powerful bot which detects the violations from clients and freelancers.
I would love to hear from you so that we could discuss in detail about your project.
Please don't hesitate to contact me.
Thanks.