Having been an accomplished React Native developer for several years, I consider myself a perfect fit for your project. My expertise includes proficiently working with Android development in Java and Mobile App Development. Specifically, I have ample experience in React Native and core APIs that can be leveraged to implement the Google Play Services "Geofencing API" and seamlessly integrate "background location services".
I also pride myself on my meticulous attention to detail, which will greatly assist me in setting up both circular and polygonal zones for geofencing, defining preset locations using various methods such as addresses, coordinates, and user selections on a map. Moreover, my ability to create in-app alerts will ensure that users are always notified about their location accurately.
On top of these skills, my well-rounded technical expertise in JavaScript, Node.js, and MongoDB is something that would definitely be advantageous when it comes to developing a comprehensive application such as yours. I am more than familiar with keeping an app functional even when it's minimized or closed.
Adhering to my commitment towards excellence, you can be rest assured that with me taking charge of this project, your React Native application will gain a top-notch geofencing and location-tracking feature. Let's connect further to discuss how we can make your vision into a reality!