Track-A-Pitch ( Pitch Count / Pitch Tracker)

We are looking for an Android and iOS developer that can create a mobile app. We would like to use Firebase for the backend but are open to any backend DB that will allow us to integrate with mailchimp and automate a welcome email to new users.

Mockups are complete and the app was published for 3 years but the backend kept producing more issues. I would like the app recoded and a new backend developed.