An ASM developer works with Assembly language, a low-level programming language for computers or other programmable devices. They are responsible for writing and implementing efficient, detailed code that directly communicates with the system's hardware. Their tasks include creating software, developing embedded systems, or optimizing high-performance applications. They are also involved in debugging and maintaining existing programs. Additionally, they often work closely with hardware engineers to understand the specifics of the hardware architecture and system design. Due to the complex nature of Assembly language, ASM developers require a deep understanding of computer architecture and systems programming.