convert Apk to Unity project

I am looking for an experienced Unity game developer to convert an existing Apk to a Unity project. The particular project I'm interested in requires an Augmented Reality Unity experience and various special features. The Unity project would need to include all of the code from the existing Apk, so my goal is to seamlessly transition to the new application. I'm open to your suggestions on how best to go about this project, so please reach out if you are familiar with the Unity platform and have worked on similar projects before. I look forward to working with you!