I've only done whiteboarding in interviews for system diagram type stuff and explaining high level ideas. At my job, this is mostly what we use the whiteboards

I've only done whiteboarding in interviews for system diagram type stuff and explaining high level ideas. At my job, this is mostly what we use the whiteboards for in day-to-day work. Some people say they built a system, but when you ask them to draw the boxes and arrows to describe how data flows, it becomes obvious what pieces (if any) they actually touched. I think the people who do best in these are either more senior in their careers or have done a lot of side-projects from scratch. They have either seen a system evolve over time and solved scaling bottlenecks or they've set up many systems with a few different stacks and have thought about what the pieces are for.