WikiRightsViaUserGroups
Hide MediaWiki pages by assigning page to a specified category.
Assign in LocalSettings.php rights for groups:
$wgGroupPermissions['Developers']['rabcg'] = ['Access2Developers'];
$wgGroupPermissions['QAs']['rabcg'] = ['Access2qas'];
And any page with category Access2Developers or Access2qas will be hidden from user's, that not in groups Developers and QAs