My former employer's titles went Engineer, Senior Engineer, Principal Engineer, Senior Principal Engineer, Fellow, Senior Fellow, Principal Fellow. Each "Engin

My former employer's titles went Engineer, Senior Engineer, Principal Engineer, Senior Principal Engineer, Fellow, Senior Fellow, Principal Fellow. Each "Engineer" title had two levels, and one needed to be in each level at least two years in order to advance, so a "Senior" needed a minimum of four years. In practice, you needed more unless you had an advanced degree.