Hi,
I have quite a bit of experience with reverse engineering Android apps, and have written my own tools to automate the process for me. I can walk you through the step by step process of breaking down an APK and extracting information such as domains, subdomains, API endpoints, API keys, hardcoded passwords. Also how to proxy an app to view the live requests going through an app and bypass certificate pinning.
Kind regards :)
Kristian Balog