Is it possible to use a Wordpress landing page for an angular app?

Hello guys!
I am building an Angular 7 application and I am wondering if it is possible to use a wordpress theme as a landing page and after the user logs in to redirect him to an angular app!
Is there a working example somewhere?
Thank you very much!

Other way round: WordPress renders HTML, so just have a WordPress site, and the page that gets rendered after you log in is the one the Angular app is attached to.

Thank you sir for your answer!
Is there an example somewhere?