Hello Mr. Jonathan ,
I'm Shomo’a, I’m an iOS Developer for 3 years, I work on local company, and I have many iOS applications published on App Store, which using Firebase (Realtime and FireStore).
I will be happy to work with you and I am confident that we will do a wonderful job.
I read what you want in your Firebase app, with multiple users, and I can fix all Not completed tasks in your source code..
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The source code written be swift or objective-c ?
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Do not hesitate to contact me any time, to discuss all the details ..