Discounts searcher

Hello,
I hope you're doing well. I’d like to share an idea for a mobile application and get your feedback. The app will target users in Argentina and will be available for both Android and iOS platforms. Its primary purpose is to help users find the best promotions and discounts from various sources.
Key Features of the App:
a.    Promotions Aggregator: The app will collect promotions from different sectors, including banks, virtual wallets, supermarkets, pharmacies, and restaurants.
b.    Geolocation: Users will see nearby offers based on their location.
c.    Search Filters: The app will offer detailed filtering options for users to search promotions based on the following criteria:
1.    Type of Financial type (virtual wallet,bank, prepaid, etcetera)
2.    Type of account (e.g., Savings, checking)
3.    Customer segment (as defined by the bank)
4.    Type of card (debit or credit)
5.    Card brand (e.g., Visa, MasterCard)
6.    Discount programs
7.    Industry (groceries, electronics, etc.)
8.    Participating companies
9.    Notifications: The app will allow users to set up notifications, not only for promotions about to expire but also for new deals based on their preferences.
10.    Registrations and Login. The user should register with a set of basic details or could complete a whole financial profile so it could receive an accurate search while login to the app.
11.    Subscription Model: Initially, there will be no restrictions, but the idea is to offer a premium version in the future with additional features.
12.    Backoffice System: The app will include a back-office system to manage the creation, modification, and removal of promotions easily.

In the future, the idea is to connect via an API to the companies so we can update the promotions.

Technology and Stack:
I’m open to suggestions regarding the best technology stack for this project, but the app should be responsive, fast, and user-friendly.
It should integrate smoothly across both Android and iOS.
Next Steps:
Please share your thoughts on the idea, along with the estimated timeline and development costs. I look forward to hearing from you.

Best regards,
Daniel