Revision of my android app (add in new features,solve a few bugs)

My android app is a customer relationship management program (written in Kotlin). My previous freelancer who wrote the app for me is no longer available, so i need someone to continue his work in adding some new features and solve some bugs in the app. My data is uploaded to firebase and the data is mostly text and some photos. I have the source code ready (downloaded from Github). Please have a look through the screenshots i attached and images showing my requirements. Look forward to work with you, thank you.