Mid-career would be associate professor or equivalent in non-teaching institution, where you begin to establish your own group, and have your own doctoral fello

Mid-career would be associate professor or equivalent in non-teaching institution, where you begin to establish your own group, and have your own doctoral fellows. A postdoc/research associate would be early career researcher, where you still are a member of a research group, but might have bachelor's and master's students under your supervision.