Although the term Senior Steemian doesn't refer to me, I'd like to say that the developer portal for Steemit is currently in early release and according to this year's roadmap, it would be soon available at developer.steem.io . Meanwhile you can check the API documents and other details at:
https://steemit.github.io/steemit-docs/#introduction
and
https://github.com/steemit/steemit-docs
Hope it should be helpful in your endeavor.
Thanks bro for your comment, gone through these many times. Btw thanks alot for your support that you are giving me on each and every stage.