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For example, what does the ability to reverse an AVL tree on the whiteboard have to do with doing UI design in XAML?

UI Design or a Frontend Software Engineer? I'd expect people working on the frontend to just as proficient in time complexity, space complexity, and performance analysis as a backend engineer. I don't particularly gravitate towards companies working in CRUD apps, but single page applications with complex UI flows and data collection can certainly need those abilities. For one, it's not particularly uncommon to have an actual tree in the UI. How would you represent that tree? How are you going to handle it as it grows to thousands of nodes?

I think few frontend developers would consider the work they do to be "UI design".

Full stack development, desktop, mobile and Web.

A UI tree component is not an AVL tree, plus most shops just stick with whatever comes with the framework, or buy some stuff like DevExpress toolbox.

Also UI knowledge requires design skills and knowing what the stack is capable of, not CS bingo about stuff I haven't used in 20 years.

I can dust off my data structures and algorithms CS book if I ever need to implement one.

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