Show your method for understanding how users think about content. Card sorting and tree testing are quick, cheap ways to validate your IA assumptions.
Look for: card sorting (open and closed), tree testing, sitemap creation, user mental model research, and iterative validation. Strong candidates discuss labelling strategies, navigation patterns, and the tension between breadth and depth. Best candidates mention how IA decisions affect findability and SEO.
Senior UX skill often overlooked in favour of visual design. Candidates who can structure complex information show strategic thinking. Ask: "How do you handle disagreements about taxonomy?"