I am an experienced android developer and have been into Android development for the past 3 years. During this period I have developed over 8 apps and published 5 of them on the play store. I have worked on Machine Learning, Rest APIs, Google APIs(maps, youtube, etc), game development, databases, firebase, etc under app development and have gained necessary skills.
I have worked a lot with firebase and know exactly what needs to be done in your case. I can complete this job within 2 to 3 days.
Let's have a chat and discuss it in detail.