This is what I do. That email in OP is gross.

"Hi, thanks for the message. I would appreciate as much detail as you can via message. Interested in location, compensation, and what specific problems they need help solving. Thanks!"

I don't take a call unless the work description is specific enough. I don't want to work on your "backend". If asked, I tell them my comp expectation is min +50k over what I currently make. And I sure as hell am not moving to the bay area.