The best part to match your job description is that I am developer of both platform (native apps).
I have gone through the job description and perceived that you are seeking for highly experienced mobile app dPlus
Hello friend, I have source code of app, which have google login, after google its run background service to fetch gps location and store in firebase. Its very simple and filter code. Please award this project to us. sPlus
Proposal for Mobile App Development
Techlab Digital was formed by a group of software developers with vast experience in software design and coding while working with some top notch services and product MNCs.
I am Pavel
Android developer with 3 years of experience, also i have experiance with design (Adobe XD).
In App billing
Really do you crave for completing your project? Don't worry!
I HAVE FULL EXPERIENCE IN DEVELOPMENT OF THE PROJECT SIMILAR TO YOURS.
I have read your project description and am sure I can give you the besPlus