An ARM Assembly Language developer writes low-level code for ARM architecture-based systems. They create, debug, and maintain assembly language programs, translating high-level language into assembly language or machine code for optimal performance. They work closely with hardware, understanding the intricacies of the ARM architecture. This includes registers, instruction sets, and memory management. They often work on critical performance parts of a system, like operating systems, embedded systems, or game engines. Their work involves meticulous attention to detail, strong analytical skills, and a deep understanding of computer hardware and software interactions.