An ANSI developer writes, debugs, and tests software programs using the ANSI standard of the C programming language. This includes using features like variable-length arrays, flexible array members, and inline functions. They also ensure program compatibility across different platforms. They may develop system-level, embedded, or real-time applications. Their work involves optimizing code for performance, memory usage, and portability. Furthermore, they may participate in code reviews, create technical documentation, and collaborate with other team members to integrate individual parts into a larger system. They also stay updated with the ANSI standard to maintain code compliance.