In larger organizations it's separate. Developers create software, add features, work with product teams. Operations teams takes the software, installs and runs

In larger organizations it's separate. Developers create software, add features, work with product teams. Operations teams takes the software, installs and runs it. Operations got more and more tasks and started automating more, thus developing their own tools, 'devops' title was created. In smaller companies the backend developer (or multiple) usually also does the devops tasks.