Hi,
I am expert in Android [ kotlin ], [ java ], [ Flutter ] apps working with quite a few years,
I have read your project proposal.
I can help you in your Android [ Java ] app for NTLM authentication with OkHttpClient in accordance with your needs.
It seems we need to discuss in detail about issues. Share the source code of app. I will check it. And also share the issue details.
So, it's would be extendable latter if you want to add new functionality in your app.
I will provide you a quality work.
Let's chat to proceed.