I work as a developer of Engineering Software. I have seen E1, E2, SE and PE used as abbreviations for level of experience (Graduate Level 1, Graduate Level 2,

I work as a developer of Engineering Software. I have seen E1, E2, SE and PE used as abbreviations for level of experience (Graduate Level 1, Graduate Level 2, Senior, Principal). These levels might have been applied to a RE (Reliability Engineer), SE (Safety Engineer), EE (Electrical Engineer) etc So there is already potential confusion in the abbreviations used for various engineering roles. SWE provides some disambiguation. Interestingly HWE seems to be used for Hardware Engineer - when they are generally Electrical Engineers.