On the basis of Vayikra 11:8, is it permitted to work as an employee at a grocery store as a cashier (not the owner of the business), which would entail touching packaged yet non-kosher food items when you need to scan them? I am asking solely from an employee vantage point, not an owner – the employee making no direct benefit from the transaction other than an hourly wage to scan items and work the till.
Since the question is asked based solely on Vayikra 11:8, the answer is (as quoted by Rashi there, but this is the generally accepted view) that there is no issue with touching them, except in connection with the Temple at the time of the holidays of Pesach, Sukkos and Shavuos (or any other time a Jew wanted to be there).
This means that even for a Kohen, the only prohibition of becoming impure is for a dead person. Animal meat is not an issue for anyone, absent some other requirement to be pure for a Temple service purpose.
That being said, there are other potential issues with doing business with non-Kosher food. See for example here. However that has to do with a different, Rabbinic prohibition where someone may come to eat from the food. Vis-a-vis this verse, there is no prohibition to handle the non-Kosher per se, rather it is prohibited to handle it when it would take away from the holiday obligations in the times of the Temple.