There's a lot of unexplored potential of Nix in granular build systems and displacing systems like Bazel. If applied correctly, it lets smaller organisations get much of the benefit of Google-style monorepos but without as much maintenance overhead.

Some friends and I have been experimenting with this for the last year over at https://tvl.fyi (code etc. is linked at the page bottom).

We've run into some issues with the current implementation of Nix, but stay tuned on that :)