We used their build system Hydra at a previous company and all of our deployments were on NixOS. Check this video out from Rob Vermaas. It's a decent case stud

We used their build system Hydra at a previous company and all of our deployments were on NixOS. Check this video out from Rob Vermaas. It's a decent case study of how Nix was applied at LogicBlox https://www.youtube.com/watch?v=nuyuA43q9NE https://www.youtube.com/watch?v=nuyuA43q9NE