General Worker Interview Question:

Answer #1
If you want to show your ambition, you can discuss how you haven't reached all of your goals yet and in that sense aren't satisfied. However, if you want to discuss satisfaction from your job discuss an experience in which you achieved something.

Answer #2
Describe your responsibilities but discuss the results/metrics that show how you made an impact on the company in that role. This way it shows you hold yourself accountable.