Guillaume has a background in computer science, engineering and applied mathematics. Regarding software systems, his main concern is correctness, reliability, and trustworthiness. He is passionate about understanding complex systems and untangling intricate issues.

In academia, Guillaume built a solid knowledge of build systems, with a focus on understanding their peculiarities and what motivated their authors to start umpteenth implementation. He still hopes to find a way to combine great ideas and make implementations converge to interoperable standards. Guillaume is a long-time Nix enthusiast and member of its community. He also enjoys fixing tricky bugs in the software he uses. He likes to say that he prefers reading code than writing it.