It can be the next Facebook, Twitter, Tiktok, or game. I can build your complex app to run o iOS, android, and web.
Unlike a web app, android apps will harness full power of the android device. Why need all this power? For some, an app this sophisticated will warrant this. Games, apps that use bluetooth, require specific types of data, etc.
I will build a single page application and/or a progressive web app using Vue.js and Node.js This is where you are using the full power of the browser to create something unique not just a ecommerce platform.
A feature complete website that handles user data. Whether it's users creating posts, buying your services, and many more. I will be using Node.JS and vanilla JavaScript for handling everything else.