I think that a lot of people leave work because they are not challenged anymore. I remember talking to someone who was leaving a company and I asked then why they wanted to leave and they told me that it was because the work was becoming boring. They were essentially doing the same thing everyday with no variations. Additionally, they were not being challenged – the person was brilliant but the work was not fulfilling to them. I think for me personally, I want to be challenged. If there was ever a point in my career with a company where I was not challenged, I too would find another opportunity. Another thing is growth in the company. If there is little to no room for advancement, this would be another thing that would make me want to leave a company. With the amount of good work that you put in, I think it is important to see growth in title and salary. In my previous internships, there was a person who had the same title and salary for over 10 years. This was really surprising to me because the amount of experience and responsibility that you get in 10 years should correlate to some sort of salary increase or positional increase.