Filter Results Server Side Parse while User is typing

Question

I am using Parse Server and Ionic 3/Angular 4 to build and application. Until, now I was retrieving the users and store them localy and make the filtering on client side with Angular on searchbar while the user is typing a username.

But I think it should be done on Server Side instead to store localy all the users of the database. Like large apps do, like Instagram.

Any idea?

thank you