Buildozer has the following user roles:
A developer is able to view and download all (failed and finished) builds and the build logs.
A tester is able to view and download all finished builds, but can't see build logs.
A release tester is only able to see and download releases (a build can be manually marked as a release). This is useful for people who only want to install a new build for example at the end of a sprint.
An administrator can see all builds, build logs, and manage the project (change all settings).