Greenfield
Work that starts from nothing: no existing code, no users, and no decisions already made.
What it tells you about a developer
A candidate who wants greenfield work is telling you what motivates them, which is a strong fit signal for a req that is a new build. Greenfield experience on its own shows the choices they made, and what happened afterwards shows whether the choices held.
Greenfield describes a project with an empty repository. Every choice is open, which is why it appeals to developers, and there is nothing to check the choices against, which is why it goes wrong quietly. Greenfield work suits people who are comfortable deciding with little information, and it rewards judgment that only becomes visible months later.