A way of expressing the first law of thermodynamics is that any change in the internal energy (âE) of a system is given by the sum of the heat (q) that flows across its boundaries and the work (w) done on the system by the surroundings:
Titles don't really mean much. Design Engineer or Associate Engineer mean something only in the confines of the company in which they are used. If you want a definition of different levels of engineers, use the definitions given by ASCE or one of the other professional societies.
For many people, the Job Title on their resume is the same Job Title from their last job. If your last position was Director of Software Development, then this is most likely the Job Title you want to use. But, if you are seeking a new position, then you should use that Job Title on your resume.