My employer has the following job titles in IT- * Associate Engineer * Engineer * Senior Engineer * Principal Engineer * Solutions Engineer * Architects,

My employer has the following job titles in IT- * Associate Engineer * Engineer * Senior Engineer * Principal Engineer * Solutions Engineer * Architects, Sr Architects, Enterprise Architects And my interpretation here for Senior is probably around Solutions Engineer, bordering on, if not completely in an Architect's domain. But the thousands of Principal Engineers and downwards all have a wide range of agency for implementing the four tiers demonstrated in the article.