Julie Zhuo on how to hire designers

“You want a designer who has looked for opportunities in their own lives: Problems that need fixing. Things that could be easier. You want someone who sees there’s a problem and wonders why no one has come up with a hack to fix it or a tool to make it easy yet. Then they go and design that tool. Do they include that in their professional submissions? If they do, that’s a good sign.”

From an interview with First Round Review. If you're looking for a primer on how to work on product at a tech company, there isn't a better place to start than Julie's Medium posts.