I can create a good looking GraphQL + Vue application for your SaaS startup.
I will use API-Platform ( Symfony / PHP ) for GraphQL implementation and Quasar Framework ( Vue Js ) .
Good parts of this combination is
With API Platform I can create REST API and GraphQL API with single code base.
With Quasar I can create Single page web application , progressive web app , android app , IOS app , desktop app, browser plugin with single code base.
I already have a demo dashboard working with all the required CRUD operations and Multi tenent architecture ( SaaS )