login-redirect-by-user-role.php

<?php
class Your_Class_Name {
    public function __construct() {
        add_filter('login_redirect', [$this, 'redirect_mervin_admin_users'], 10, 3);
    }

    public function redirect_mervin_admin_users($redirect_to, $requested_redirect_to, $user) {
        if (isset($user->roles) && is_array($user->roles) && in_array('mervin_admin', $user->roles)) {
            return 'https://www.mervin.in/staging/dashboard/?section=home-section';
        }
        return $redirect_to;
    }
}

// Instantiate the class
new Your_Class_Name();