Let me explain a little better, and again I am only basing this all off the small amount of data we have.
Let me give an example as I am not the best at articulating. hopefully this helps.
Lets say I hired this engineer as Senior or Team Lead. Now I want the base docker image we use for node bumped a major version. I checked the changelog for the nodes releases and knowing our codebase I think its safe.
I could ask a Junior dev to do it, but I knowing that they are lacking experience this may seem like a "big deal" when really its not.
What I want is the node version updated, validation unit tests pass, regressions tests are good. And it to be released. If there is a failure along the way, address it or sure lets chat about it.
But this Email in response to hackerrank - would make me perceive this to be someone who would respond with a complete change to our CI/CD processes, to our infrastructure, maybe to even using Node - as this sort of task is beneath him.
Sure there would be areas this person might excel at, but some days little tasks just need to get done to keep the ball moving.