[D] How to prep for a deep learning/machine learning job? • r/MachineLearning

How should I prep for a job like deep learning engineer or research engineer? I've been refreshing my CS basics with CTCI and LeetCode, but I don't know how much time I should spend on that versus reading papers and refreshing machine learning knowledge. Should I be able to do backpropagation with ease on a whiteboard? Ideally, I'd like to get involved in research and go back to school eventually.