Fix Flutter App & Firebase

I am looking for an experienced Flutter developer with Firebase knowledge. I have a list of things that need to be done, but you will get the small tasks first to show me you're capable. No agency, only independent developers.

The issues that I want to be fixed:

1. Push notifications are coming through twice.
2. On the profile page, I have a button to delete the video or photo, but once pressed, nothing happens. When you press it, I want it to remove the content from the profile and Firebase storage.
3. Fix Facebook sign-in / sign-up. I'm unable to sign in or sign-up with FB (the SDK is implemented but just needs setting up)
4. I want the location to refresh automatically when you open the app. At present, you have to refresh it manually by pressing the button.

This is a simple task.

I have used one developer since the start, but I want to gain the trust of other developers to join the project. I want reliable and good developers. I want you to provide recommendations and advice.

NDA is a must before work can start. If you read everything and believe you have the experience and skillset, please reach out and add "SNAZ" to the comments.

Thank you