Presumably the exercise is predicated on the notion that you give someone a task that they should be able to complete properly within the allotted time. Person

Presumably the exercise is predicated on the notion that you give someone a task that they should be able to complete properly within the allotted time. Personally I think it's pretty reasonable to think if you're hiring for a Sr. frontend developer who claims React experience, that they could spin up a basic SPA with a few React components for ToDo items in under an hour. I know I could do it and I don't even particularly like writing frontends.