Locate a Phone Android App

I want to create an Android app to locate people.
I'm looking for some specific features and would like to work with a professional person who has made similar apps before.

I am looking for a modern and current app design. Below I will list the main features of the application.

The features of the application are as follows:

Integrated subscription with Google Play services
Integration of updated maps to show location
Show real-time location
App Native
Creation and management of users with email/phone number
Integration of a basic chat between users
Connect two or more users in the same group to share location
Notifications to alert the user that the person is nearby
Using unique codes/urls to connect two users