Worked on privacy and access-control enhancements for user profiles in the rubygems/rubygems.org repository, focusing on backend development using Ruby and Ruby on Rails. Addressed a bug by ensuring that profiles belonging to users with unconfirmed emails return a 404 Not Found response, thereby improving data privacy and access reliability. Introduced a confirmed scope to the User model and updated the ProfilesController’s show action to enforce these new access rules. Developed comprehensive tests to validate the behavior for both confirmed and unconfirmed users, providing coverage against regressions and supporting ongoing reliability and maintainability of the access-control logic.