use Win32::IE::Mechanize;

my $ie = Win32::IE::Mechanize->new( visible => 1 );
    $ie->get( 'URL' );
    $ie->submit_form(
        form_name => 'j_security_check',
        fields    => {
            j_username => 'USER',
            j_password => 'PASS',
            j_mapping_key => 'REALM'
        },
        button    => 'Login',
    );
    $ie->follow_link('JobPosts/List/NewJobPostList.aspx');
    print $ie->content();