Drupal, change front page by user role.

icareix_global.module

/**
 * Implements hook_preprocess_block(&$variables).
 */
function icareix_global_preprocess_block(&$variables) {
  if ($variables['elements']['#plugin_id'] == 'system_branding_block') {
    // Select front page by user role.
    $current_user = \Drupal::currentUser();
    $current_uid = $current_user->id();
    $config = \Drupal::config('icareix_global.FrontPageByRole');
    $url = \Drupal::config('system.site')->get('page.front');
    $url = \Drupal\Core\Url::fromUserInput($url, ['absolute' => TRUE])->toString();

    if ($current_user->hasPermission('job_admin') && $current_uid != 1) {
      if ($config_url = $config->get('for_job_admin')) {
        $url = \Drupal\Core\Url::fromUserInput($config_url, ['absolute' => TRUE])->toString();
      }
    }
    elseif ($current_user->hasPermission('available for hire') && $current_uid != 1) {
      if ($config_url = $config->get('for_care_giver')) {
        $url = \Drupal\Core\Url::fromUserInput($config_url, ['absolute' => TRUE]);
        $url = $url->toString();
      }
    }
    elseif ($current_user->hasPermission('receiver') && $current_uid != 1) {
      $job = Drupal::entityTypeManager()
        ->getStorage('job')
        ->loadByProperties(['field_care_receiver' => $current_uid]);

      if ($job) {
        $job_id = current($job)->id();
        $url = \Drupal\Core\Url::fromUserInput("/job/$job_id", ['absolute' => TRUE])->toString();
      }
      else {
        if ($config_url = $config->get('for_care_receiver')) {
          $url = \Drupal\Core\Url::fromUserInput($config_url, ['absolute' => TRUE])->toString();
        }
      }
    }

    $variables['content']['front_page'] = $url;
  }
}