Live Convoy Kit: a Flutter + Firebase starter kit I packaged and sell on Gumroad. Join a group by code, see every vehicle on a live map, keep tracking in the background, and lock it down with membership-gated security rules and a Cloud Function. It ships with 13 end-to-end tests in the Firebase Emulator Suite, an emulator mode so buyers can try it without a Firebase project, and setup docs. https://harborkits.gumroad.com/l/tjlbf