At 24, Mayer became employee number 20 at Google and the company's first female engineer. She remained with the company for 13 years before moving on to her role as CEO of Yahoo.

Google didn't have the sorts of lavish campuses it does now, Mayer said in an interview with VMakers, "During my interviews, which were in April of 1999, Google was a seven-person company. I arrived and I was interviewed at a ping pong table which was also the company's conference table, and it was right when they were pitching for venture capitalist money, so actually after my interview Larry and Sergei left and took the entire office with them."

Since everyone in the office interviewed you those days, Mayer had to come back the next day for another round.

(Source: Businessinsider)