I need some thorough testing of an android mobile app

I need an experienced developer or QA tester to review an android mobile app I am developing.
It is currently in the closed testing loop with Google Play store.
The app helps to calculate gear ratios, so some mechanical engineering experience or knowledge would be good but not required, full instructions on how to use the app will be provided
You will need to provide the email address of the google account associated with any devices you will use.
Test the user interface looking for any bugs, crashes, or just parts of the app that are unclear or confusing.
Ideally using multiple different android devices if available.

Deliverables
I expect a written report on any issues you found, including steps to reproduce and ideally screenshots aswell where appropriate.
Details of the exact device android version, dark mode enabled/disabled, device manufacturer and model number

In your offer tell me what you will be doing, and your previous experience which makes you suitable for this job.