I want to show post details based on roles user login

by

Do something like this in your front end code.

<?php 
    $user = wp_get_current_user();
    $is_manager = in_array('manager', $user->roles);
?>
<?php if($is_manager): ?>
    <div>insert manager only content here</div>
<?php else: ?>
    <div>insert employee content here</div>
<?php endif ?>