I agree that this particular example makes no sense. If I'm looking to hire a React developer to help me achieve my business goals, what I care about is how pro

I agree that this particular example makes no sense. If I'm looking to hire a React developer to help me achieve my business goals, what I care about is how proficient is the candidate is in React. Unless it was it was decision of the developer to do the rewrite, the metric is out of context. Better example built around the engineering skills, which are probably more relevant: "Lead a team of two migrating our 100 Backbone Views front-end to React in two months, without disrupting deployments"