Does anyone (here) do this?

That is, working full time as a software engineer (and benefiting from the income and job security) while still spending a lot if not most of your free time studying maths (through textbooks, online lectures, problems, etc.)

I'm asking this because I graduate from my BSc next June and I'm in the position to look for software engineering grad jobs, but my passion in life really is mathematics (as much as I see the beauty in programming - that is, actually interesting programming as opposed to libraries and frameworks).

I've come to the conclusion that I don't actually mind simply programming for a living, but I think it's very important for me to have the free time at the very least to work on mathematics, primarily for the sake of learning maths rather than discovering anything new. Just wondering if anyone here actually lives this kind of lifestyle.

The alternative is going on to study masters and phd in theoretical/mathematical CS, but even as a high performing student academic life from here on just seems less certain and more stressful compared to industry.