Hi! Thank you for the detailed project description, that is one the reason I'm applying given the number of bad project descriptions on this website.
I would implore you to limit the project scope for now until you can afford an in-house team of your own. This app will work but since it carries details of peoples subscriptions (login details) and integration with other services, upkeep and constant testing will be needed, along with adding new features. It simplely cannot be deployed and left on its own.
Think of it this way, to get the best deals for a certain subscription you need the details from that company and they will have to authenticate that request to make sure you are not using it for malicious work. Thus you also need to have a constant business development aspect to this.
Now, if you agree on working on this we can build a full prototype for you to test and demonstrate the concept. For that reason, the price is kept low.