cv - What author position on publications is best for early-career academics in physics: First or last author?

I am physicist, I do research in theoretical biophysics, and I just got a permanent position. I am still collaborating with my former postdoc advisor, with whom I already published, and we are about to submit a new paper.

When I was a postdoc, the best thing for my CV was to be first author. It is not entirely clear to me what would be the best thing now for my CV. Should I aim at being last author, corresponding author, or still first author?

I have asked this question to people working in different scientific areas, and got very different answers.