tell me if you design a app without outage or minimum outage , how you will design architecture . how kafka works , tell me any major kafka topics which you have worked on .

It was an online remote interview with DOT. He was in a hurry to wrap up 1 hour interview in 30 mins as he had to take a break. He came with a bent of mind to reject the candidate, so whatever you answer, he will have silly followup questions like how will you write boilerplate codes when spring boot was not there, how do you write? Why you are using annotations etc.