Web scraping app

Hello my Friends.

I hope somebody can suggest me something.

The idea was creating a cross-platform app for IOS and Android that will be doing Web Scraping from an advertisement site. Basically it will check for new ads and notify the user about them (in a selected category of a site).

First i started doing this app in Angular, Ionic and then i realized that i have to implement backend also for scraping data from the site. So i had to use nodejs… And you can see that it is consuming a lot of resources of the server (imagine if there are 30 categories or more and we have to scan them every minute).

That is why i don´t want to use serverside for web scraping. So my question is: can we implement this logic (web scraping) with Kotlin in smartphone, without backend.? Both for IOS and Android