I currently work for a non-profit investigating making a free high quality set of courses in this space, and would love to talk to as many people either working in ML/DS or looking to get into the field. (I have ideas but would prefer to ground them in as many real-world experiences as I can collect.)
If anyone here wouldn't mind chatting about this, or even just sharing an experience or opinion, please drop me an email (in my profile).
EDIT: We already have Into to DS, and a Deep RL sequence far along in our pipeline, but are looking to see where we can help the most with available resources.
I really appreciate this Interviews book as an example of what topics might be necessary (and at what level), taking into account the qualifying discussion here, of course.