Working @ Habit Analytics create a SPA.
Selfcare is a very demanding and ambitious SPA built from scratch using essentially React (CRA) and SASS.
Almost all React components are build from scratch. Very few libraries used.
It has dozens and dozens of routes to manage all sort of things from creating a Product with a lot of features (White label app; IoT integrations; manage users; documents; settings; etc...), manage insurance, analytics (graphs and maps), integrations (IoT), create and manage Networks, Insurance distributors, etc...
Due to a NDA, I cannot share the work I've done.