2 App Android tracking routes, share and Backend: PHP

Create two apps and a backend. APP is a user to share your route with another user, you can save your frequent users who share route and also frequent routes, panic button may be pressed by any user and send an alert to the second APP and Backend. The second APP, will make a tracking of all users who use the first APP. Will have a tracking mode and emergency. To help when there is an emergency alert button. The Backend, all users visualize and that track in the background, you can see which users have pressed the panic button and select who will assist you go to their aid. Android Apps and Backend is Linux / PHP. Experienced developer or team: Using google maps API Experience in geo-localization, tracking, sharing route. Similar apps have taxis, car sharing route, etc. (must send links to apps) Backend do have experience with PHP and Linux screenshot or show backend access to review. (PLEASE ONLY THOSE SKILLS)