A GNU tools developer is proficient in a wide range of open-source software tools which are integral to many development processes. They can handle tasks related to software building, debugging, and version control efficiently. Their experience with GNU tools allows them to automate tasks, improve software reliability, and speed up development times, leading to enhanced productivity. Furthermore, their knowledge can be crucial in solving complex software issues and maintaining high-quality code standards. They can also contribute to the open-source community, keeping your company abreast of the latest developments.