At GitLab, we have a clearly defined organizational structure. Within that stucture, we have Product Groups[0] which are groups of people aligned around a specific category. The name "Single-Engineer Groups" reflects that this single engineer owns the category which they're focusing on.
I'll be sure to surface your question to the leader of our Incubation Engineering org. Thanks.
[0] - https://about.gitlab.com/company/team/structure/#product-gro...