What is the best way to write a mobile application for an existing web service?

Question

Android

There is an existing web service that is not well adapted to mobile use, for example something like CRM. It is necessary to make a mobile application for it:
- quickly
- with as little effort as possible
- so that in the future it will be easy to maintain
- for Android and for iOS
The mobile application will actively interact with our backend and with the API of mobile phones.
It will be necessary to write the code from scratch, it will not work to use the frontend of the site.
If you hire a developer for this business, then what technologies should he be able to use? (backend/design on us)
Which solution is better to choose in our case? Native? PWA? Any other solutions that allow you to write cross-platform for iOS and Android?

Answer 1

On Vue Native or React Native. If you write the API backend yourself, you can get by with one Vue Native or React Native developer.

Answer 2

Nativescript