System Design · LinkedIn · Hard
1. Motivation — what makes the watch-page rail hard Every YouTube watch page displays a short list of suggested videos alongside the player. That tiny strip of real estate heavily influences whether a viewer stays on the platform or leaves for something else. Our job is to design the service that fills it. The business objective is not simply to maximize the next tap. We want to grow meaningful watch time across a whole session so that creators can build an audience and the…