One of my pet peeves... It&#x27;s principal, not principle. Sure, I hope principal engineers have principles, but that&#x27;s not what their title says. Principal, as in &quot;main engineer&quot;, not &quot;engineer with scruples&quot;.<p>Generally, a principal engineer is one of the highest engineering titles (the only one above would be fellow), which means you are invited to management-only meetings, essentially.