Hello Hiring Manager,
I read your details and I understand is that you wish to command line binary of ownCloud/Nextcloud and client authenticate using the Keychain.
Relevant Skills and Experience
We are expert in C Programming, C++ Programming, Machine Learning, Software Architecture. If you wish to see our Software that we are developing in C++ so we can show you as you want.
Proposed Milestones
€600 EUR - We will discuss in private message board.
I need to discuss with you more in detail to understand your requirement better way.