Hello @Sinan SARI - welcome to the community.
Bitbucket Datacenter ships with a reviewer group feature however the feature is blocked off for Bitbucket Server edition.
I totally agree that reviewer groups is a powerful feature for 3 reasons:
You always target the right reviewers: group names are easier to remember when adding reviewers
Groups are always up to date: group memberships change, group names don't
Great flexibility for review process: require a minimum number of approvals per reviewer group. group members can cover for each other
As a solution you can upgrade to Bitbucket Datacenter or install the Workzone for Bitbucket app which will give you all you need and more:
* AD based reviewer groups
* File and module based reviewers (invite specific teams for different files/directories/modules of your code base)
* Pull request Workflow automation with adding reviewers and groups, monitoring approvals, build results and tasks
* Granular merge control to enforce consistent pull request review best practice.
Check out the app and let me know your thoughts.
Happy to help!