Google maps API Integration | GPS LIVE tracking + location pick up etc. wherever applicable within the project

We have a marketplace app wherein pet groomers, veterinary could be booked at @home. While most of the app is built, the GPS integration part is left. We need to close the same urgently.

Looking for someone who is PRO at GPS integrations of google maps. Previous experience in GPS integration is a must.

The app is built in Flutter; the backend is in NodeJS and MongoDB.