I'd also include knowing a lot about computers. Like how they work at a low level, how they represent numbers, low level networking protocol, how the operating

I'd also include knowing a lot about computers. Like how they work at a low level, how they represent numbers, low level networking protocol, how the operating system interfaces like interrupts, how processes and threads work. A computer science education really helps, but you'll also have to be able to solve problems and think about how theory and real physics world collide.