Of all your past projects, pick your favorite and explain to me your role, contribution, and lessons learned.

It is okay to boast a little when answering this question. Be proud yet humble, and not arrogant. Describe how this achievement acts as a milestone towards your goals, and why you regard it as a success in your personal development.

"I designed this widget I nicknamed the dingus. It was a fabulous doohickey. I designed a marketing plan for it and everything. From production costs to distribution to advertising... I left no stone unturned. But the amount I learned... the research truly was a rabbit hole, and I felt right at home. This was the first time I discovered how thrilling such research and planning could be."