Thanks for your question Ravi 
I think for very junior folk looking for their first job the remote setup is hard, there is so much learning that can happen by spending 1-2 years in an office environment surrounded co-workers, eating lunch with co-workers, etc. without going through that experience there would certainly be a part of professional development missing. I think the most important thing to helping your people develop and grow is to have really great leaders. Great leaders are passionate, inspiring, highly competent, engaging and empathetic, and they lead by example. So the best thing I can do is to try and attract (or promote from within) leaders who have these characteristics.
In terms of 1-on-1s I think once every two weeks is about right once an employee is fully ramped.