2, building this level for junior engineers and assistant engineers what is the difference, theoretically and in real life called to say is the same, as it relates to the common call, assistant engineers and junior engineers are the same, the so-called engineers, is divided into: primary, intermediate, associate senior, senior, in daily life junior engineers are called assistant engineers, referred to as "Assistant". 3, engineers called intermediate engineers, senior engineers is actually deputy senior engineers, senior engineers will be directly said senior engineers, in fact, often life people will be so called for convenience, especially the title of this professional organizations in the jargon will also say that the abbreviation.