Conversation so far:
Did Marissa Mayer ever work for Google?
She joined Google in 1999 as employee number 20.
What was Marissa Mayer's position at Google?
She started out writing code and overseeing small teams of engineers, developing and designing Google's search offerings.

Question: Did she ever receive a promotion to a higher position?
Self-contained rewrite: Did Marissa Mayer ever receive a promotion to a higher position?