> What do you do, if I may ask? The only roles that I'd characterize as you describe are fixed income management and some actuarial roles
What? As a software engineer, I'm constantly doing mental math to determine things like "how much memory will this take up when the input size is X". Sure, Big O notation is nice for limits, but in real life, there are typical input ranges, and you have to do the calculation. Can I use a calculator? Maybe sure, but why would I?