A cross-compiler developer designs and builds compilers that translate code written in one programming language into another language, but for a different system architecture. They focus on creating software tools used for developing applications for systems or platforms different from the one on which the tool runs. They manage the complexities of different hardware architecture, operating systems, or embedded systems. They ensure the efficiency and correctness of the translated code, handle different data types, and deal with system-specific issues. Their work is crucial for porting software across different platforms and for developing software for embedded systems.