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I think the point is: portfolio = "what did you do?", whereas resume = "where did you work?"

If all your resume contains is a list of previous employers, that is a horrible resume!

Where/when you worked should be just a company name and a date. That's it. It should be followed by a very brief description of what you did there.

So OP's resume would contain something like:

- Lumera (2002-2006):

I was solely responsible for version 1.0 of the software and led the team that did version 2.0.