This question looks easy to answer. But you can use it as an opportunity to tell about your role in the team.
Sample answer is:
In our company we follow Scrum methodology for Agile development. So team structure is created according to Scrum team. In my team there are 3 developers, 1 QA engineer and 1 product manager. I am the lead engineer in team. I take care of designing projects and working on complex tasks. I am also responsible for over all code quality and code reviews.Read the full book at www.amazon.com