Could this just simply be because women are increasing the labor supply, and thus driving down the cost of labor in that field?
If the comparison is between teaching "CSS, HTML, and Javascript" and "writing CRUD apps in Python," sure, they're about equal.
I think people get their wires crossed a bit though with backend tasks where you might need to debug a race condition, or like, be a Linux expert. Since companies typically pay for backend resources, they're also more likely to assign engineers optimization tasks to reduce costs. These are basically Senior Backend SWE tasks, but people don't stop to consider what a comparable Senior Frontend task might be.
And thinking about it, they're the kind of thing you'd also need to be a Linux expert at. Like, half the problems YSlow flagged on my projects were things Sysadmins needed to handle, like slow DNS, or ETags. So they typically got foisted on me, rather than the frontend engineer.
> it’s a repeated trend that when women enter an industry, pay for that industry in particular goes down
Honestly, I have no idea how one disentangles supply and demand effects, from cultural and regional effects. One random HBR article suggests that comparing locations by woman partipicaton rate reverses the trend, to where more women _increases_ local median wages: https://hbr.org/2018/01/when-more-women-join-the-workforce-w...
I can also say hiring for a frontend dev does not mean they can do backend work, whereas a backend dev (in my experience) is able to jump into the frontend with relatively little friction when needed.
YMMV of course, but this has been what I've see in in my ~20 years.
On the hand, you don't have any control at all for the frontend, especially for consumer products.
Modern web browsers have abstracted all of the resource management problems away from the app developer. The worst you can do is crash the browser, which is a pretty easy problem to avoid.
Do you work in HFT? I consider that basically a subspecialty of systems programming.
Did you peek at my comment history? How did you figure that out? Not HFT, but trading systems yes.