Given their background I think they meant nix as Linux/Unix and not Nix the programming language/package manager. Despite its clear fit with the current hotnes

Given their background I think they meant nix as Linux/Unix and not Nix the programming language/package manager. Despite its clear fit with the current hotness of immutable systems and functional programming, I don't think I've seen anyone in for-profit industry on a Nix/NixOps stack.