Having interviewed hundreds of people over the years, when I ask a question like that I'm looking for the following things: 1. What kind of problem do you real

Having interviewed hundreds of people over the years, when I ask a question like that I'm looking for the following things: 1. What kind of problem do you really enjoy and find interesting? 2. Did you do it because you had to (in a class) or in your free time? 3. What technologies did you use and why? 4. Did you work in a team? If so how did the team collaborate and did it work well? In a lot of ways it can tell you the most about a person because it is so open ended. Your answer says a lot about what you think is important and what you value in your work and likely will value in your job. If you start with the technologies you used that is a lot different than if you start with the problem you were solving. So, I recommend picking a project you really loved and just be honest. If it's the right fit then the interviewer will hear exactly what they want to hear.