Hello,
Read about your project description, I can work for you and can give you solution for your problem, I have checked the given github link and it looks very simple to implement in the application. Also i have developed multiple application using firebase so i can help you in that as well.
I have 7+ yrs of experience in android application development. I will give you good quality work with long time support. Please visit my profile page for my work quality.
Thank you for taking time to read about my project proposal, looking forward to work with you.
Best Regards,
Silvans