SHIELD Software Engineer - Front End interview questions

Interviewer started 20 mins late, first red flag. Backend developer came as interviewer for frontend position, second red flag Basic questions asked like difference between JS frameworks, how to optimise code and algo time complexity. Interviewer was expecting very textbook answers, like I explained React’s performance is better due to it’s node diffing algorithm, but interviewer said no its due to Virtual DOM (face palm) Guys if somebody is saying React is faster due to virtual dom, then he/she hasn’t worked on frontend technologies as startup and running speeds in Angular or React isn’t significant, what really cuts the bar is how one can implement Immutability and functional components in much modular way which makes React faster Next day they informed the recruiter that I had been rejected as they were looking for someone with higher experience in backend.