Which jobs are, respectively, the least and most mathematical in work content?
Motivation: I am currently pursuing an MS in mathematics (part-time, top 10-20) and plan to apply for a PhD program in algorithms & discrete math within the next 5 years.
Applied ML research can be mathy at the right place.
All this said, if you like writing code do yourself a favor and just get good at C++ and get rich at a HFT. Industry math is a huge disappointment compared to school.