Flutter/Node/MongoDB/Angular developer is required to fix few issues in live android app (And to convert to iOS)

The app is already live on Android... The app is in: Flutter My app backend is in: Angular + Node.js + MongoDB The app needs 3 basic modifications/fixes in apps... After this it needs to get converted and uploaded on iOS App Store Fixes Required: 1: Remove the loader from the homepage when scrolling, so all categories can show at once without scroll (And categories should open smoothly) 2: When we should press back more than three times it should come to the homepage and then directly exit (Now it first opens all screens that we opened in-app before closing by pressing the back button) 3: While uploading photos in the vendor app: Now it takes a lot of time while signup: (If we upload 3-4 photos of 3-3 mb) (Rescue fields + Reduce Image upload time) _________________________ _________________________________ _____________________________ After these fixes... we need to simply convert same into iOS