What is the largest project you have ever worked on and how did you manage it?
The interviewer wants to learn more about how you handle yourself when you're involved in a big project. Tell them about the project, what your contribution was, and the end result. Consider discussing what you learned from the experience and how you will carry those lessons into the future with you.
"The company I currently work for was just a small startup when I began working there. Now it's larger and continues to grow in size. Initially, we sold to small mom-and-pop companies but over time this evolved into closing very large multi-seat financial companies. A year ago, a large company that we had closed on not that long ago for just a few seats started expressing interest in expanding their account. My boss put me in charge of it. Over the next eight months, I worked multiple angles and developed numerous new contacts within the company. I remained persistent over time and eventually was able to increase the number of seats at the company to over a hundred, resulting in a large boost in revenue for us."