Flutter Developer for Essential Features

I am in need of a proficient Flutter developer to construct fundamental features for my mobile app. There are three specific functionalities required but I am open to expert opinions and guidance.

Key Duties and Responsibilities:

* Design and build advanced applications for the mobile platform
* Collaborate with cross-functional teams to define, design, and ship new features
* Work on bug fixing and improving application performance

Ideal Experience and Skills needed:

* Proven working experience in software development
* Working experience in iOS and Android app development
* Have published one or more iOS or Android apps in the app store
* A deep familiarity with Flutter
* Experience handling user authentication and registration, push notifications, and in-app messaging
* Flutter design and user interface abilities, with an understanding that I may need assistance in this area, would be greatly appreciated.

I encourage you to include past work, your professional experience and a detailed project proposal in your application.