I made some corrections. Please check now.

var gr = new GlideRecord("sys_user");
gr.addQuery('active', 'true');
gr.addQuery('company', 'LIKE', 'companyname'); //we have multiple companies, but all contain a specific word.
gr.query();
while(gr.next()) {
var role = new GlideRecord('sys_user_has_role');
role.addQuery('user',gr.sys_id);
role.addQuery('role', '7fcaa702933002009c8579b4f47ffbde');
role.query();
if(!role.next())
{
role.initialize();
role.user = gr.sys_id;
role.role = "7fcaa702933002009c8579b4f47ffbde";
role.insert();
}
}

Feel free to mark correct and helpful.