Your question is Note-Taking Feature in Kindle. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
How would you add the Note taking feature in the Kindle app?
Asked in the Onsite / Loop Interview 2 (System Design) stage. Initially assume one note per book for a user, then expand the design to support any number of notes per book using a microservices architecture. A reported follow-up is: design the data model for the Notes service.